Biology Practice Questions PDF

### **Question 1** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | What are the products of | | | glycolysis? | +-----------------------------------+--...

### **Question 1** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | What are the products of | | | glycolysis? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | --------------------------------- | | | ---- | | | Correct Answer: Two pyruvate | | | molecules, 2 NADH, and 2 ATP (net | | | ). | | | ----------------- ------------- | | | --------------------------------- | | | ---- | +-----------------------------------+-----------------------------------+ ### **Question 2** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | What is the function of oxygen in | | | aerobic respiration? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | --------------------------------- | | | --------------------------------- | | | ---------- | | | Correct Answer: It is the fin | | | al acceptor of electrons and H+ i | | | n the electron transport phosphor | | | ylation. | | | ----------------- ------------- | | | --------------------------------- | | | --------------------------------- | | | ---------- | +-----------------------------------+-----------------------------------+ ### **Question 3** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Before it enters the Krebs cycle, | | | what has to happen to the | | | pyruvate molecule? | +-----------------------------------+-----------------------------------+ | | +--------------+--------------+ | | | | Correct | e. | | | | | Answer: | | | | | | | Both a and c | | | | +--------------+--------------+ | +-----------------------------------+-----------------------------------+ ### **Question 4** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Humans are | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | because we require oxygen to | | | survive. | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | ----- | | | Correct Answer: obligate aero | | | bes | | | ----------------- ------------- | | | ----- | +-----------------------------------+-----------------------------------+ ### **Question 5** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Why did organisms need to evolve | | | a way to deal with free oxygen in | | | the atmosphere? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | --------------------------------- | | | --------------------------------- | | | --------------------------------- | | | ------ | | | Correct Answer: Oxygen is hig | | | hly reactive, reacting with metal | | | s, organic molecules, and creatin | | | g free radicals that damages tiss | | | ues. | | | ----------------- ------------- | | | --------------------------------- | | | --------------------------------- | | | --------------------------------- | | | ------ | +-----------------------------------+-----------------------------------+ ### **Question 6** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Lactate fermentation occurs in | | | the muscle cells of animals when | | | oxygen is absent but they need to | | | keep working. | +-----------------------------------+-----------------------------------+ | | ----------------- ------ | | | Correct Answer: True | | | ----------------- ------ | +-----------------------------------+-----------------------------------+ ### **Question 7** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | What is the source of all oxygen | | | in the atmosphere? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | --- | | | Correct Answer: photosynthesi | | | s | | | ----------------- ------------- | | | --- | +-----------------------------------+-----------------------------------+ ### **Question 8** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Why is the visible light spectrum | | | a narrow section of the entire | | | electromagnetic spectrum between | | | 400 and 700 nm and not higher or | | | lower? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | --------------------------------- | | | --------------------------------- | | | --------------------------------- | | | --------------------- | | | Correct Answer: It is the par | | | t of the spectrum that has enough | | | energy to excite electrons in pi | | | gment molecules but low enough no | | | t to damage tissue. | | | ----------------- ------------- | | | --------------------------------- | | | --------------------------------- | | | --------------------------------- | | | --------------------- | +-----------------------------------+-----------------------------------+ ### **Question 9** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | All of the oxygen used by animals | | | is produced by photosynthetic | | | fungi and bacteria. | +-----------------------------------+-----------------------------------+ | | ----------------- ------- | | | Correct Answer: False | | | ----------------- ------- | +-----------------------------------+-----------------------------------+ ### **Question 10** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Which statement about | | | photosynthesis is not true? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | --------------------------------- | | | --------------- | | | Correct Answer: Photosynthesi | | | s takes place in the mitochondria | | | of the cell. | | | ----------------- ------------- | | | --------------------------------- | | | --------------- | +-----------------------------------+-----------------------------------+ ### **Question 11** 1 out of 1 points +-----------------------------------+-----------------------------------+ | | You are standing in the | | | grasslands of Kansas. It is hot | | | with moderate levels of humidity. | | | Most of the plants are using | | | \_\_\_\_\_\_\_\_\_\_\_\_\_ type | | | of carbon fixation to do the | | | light-independent reactions of | | | photosynthesis because it results | | | in less water-loss under these | | | conditions than C3. | +-----------------------------------+-----------------------------------+ | | ----------------- ---- | | | Correct Answer: C4 | | | ----------------- ---- | +-----------------------------------+-----------------------------------+ ### **Question 12** 1 out of 1 points +-----------------------------------+-----------------------------------+ | | What are the products of the | | | electron transport | | | phosphorylation? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | ----- | | | Correct Answer: Water and 32 | | | ATP | | | ----------------- ------------- | | | ----- | +-----------------------------------+-----------------------------------+ ### **Question 13** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | In photosynthesis, glucose is | | | produced during what step? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | --------------- | | | Correct Answer: Light indepen | | | dent reaction | | | ----------------- ------------- | | | --------------- | +-----------------------------------+-----------------------------------+ ### **Question 14** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Yeast and some bacteria are | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | because they can live with or | | | without oxygen. | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | ---------- | | | Correct Answer: facultative a | | | naerobes | | | ----------------- ------------- | | | ---------- | +-----------------------------------+-----------------------------------+ ### **Question 15** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | How many ATP are produced from | | | one glucose molecule in anaerobic | | | respiration? | +-----------------------------------+-----------------------------------+ | | ----------------- --- | | | Correct Answer: 2 | | | ----------------- --- | +-----------------------------------+-----------------------------------+ ### **Question 16** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | What are stomata? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | --------------------------------- | | | ------------------------------ | | | Correct Answer: Pores in the | | | underside of leaves that open to | | | allow CO~2~ in and O~2~ out. | | | ----------------- ------------- | | | --------------------------------- | | | ------------------------------ | +-----------------------------------+-----------------------------------+ ### **Question 17** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | A(n) \_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | is a molecule that absorbs light. | +-----------------------------------+-----------------------------------+ | | ----------------- --------- | | | Correct Answer: pigment | | | ----------------- --------- | +-----------------------------------+-----------------------------------+ ### **Question 18** 1 out of 1 points +-----------------------------------+-----------------------------------+ | | Aerobic respiration results in | | | more ATP production than | | | anaerobic respiration. | +-----------------------------------+-----------------------------------+ | | ----------------- ------ | | | Correct Answer: True | | | ----------------- ------ | +-----------------------------------+-----------------------------------+ ### **Question 19** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Which of the following plants is | | | a CAM plant? | +-----------------------------------+-----------------------------------+ | | ----------------- -------- | | | Correct Answer: cactus | | | ----------------- -------- | +-----------------------------------+-----------------------------------+ ### **Question 20** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | During photosynthesis, energy | | | from the electron transport chain | | | is used to pump what ion into the | | | thylakoid compartment? | +-----------------------------------+-----------------------------------+ | | ----------------- ------ | | | Correct Answer: H^+^ | | | ----------------- ------ | +-----------------------------------+-----------------------------------+ ### **Question 21** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | How can molecules other than | | | glucose enter aerobic | | | respiration? | +-----------------------------------+-----------------------------------+ | | +--------------+--------------+ | | | | Correct | d. | | | | | Answer: | | | | | | | Both a and b | | | | +--------------+--------------+ | +-----------------------------------+-----------------------------------+ ### **Question 22** 1 out of 1 points +-----------------------------------+-----------------------------------+ | | After 2 electrons are ejected | | | from Photosystem I, which of the | | | following reactions occurs? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | ------------------------------ | | | Correct Answer: NADP+ is redu | | | ced by adding an H^+^ to it. | | | ----------------- ------------- | | | ------------------------------ | +-----------------------------------+-----------------------------------+ ### **Question 23** 1 out of 1 points +-----------------------------------+-----------------------------------+ | | Which of the following organisms | | | undergo cellular respiration to | | | release energy from organic | | | matter? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | ----- | | | Correct Answer: all of the ab | | | ove | | | ----------------- ------------- | | | ----- | +-----------------------------------+-----------------------------------+ ### **Question 24** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | What are the end products of | | | photosynthesis? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | ------- | | | Correct Answer: Glucose and o | | | xygen | | | ----------------- ------------- | | | ------- | +-----------------------------------+-----------------------------------+ ### **Question 25** 1 out of 1 points +-----------------------------------+-----------------------------------+ | | Why are plants green? | +-----------------------------------+-----------------------------------+ | | +--------------+--------------+ | | | | Correct | e. | | | | | Answer: | | | | | | | Both c and d | | | | +--------------+--------------+ | +-----------------------------------+-----------------------------------+ ### **Question 26** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | When oxygen returns to the muscle | | | cells, what happens to the lactic | | | acid generated during anaerobic | | | respiration? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | --------------------------------- | | | ---------------- | | | Correct Answer: It is convert | | | ed back to pyruvate and enters th | | | e Krebs cycle. | | | ----------------- ------------- | | | --------------------------------- | | | ---------------- | +-----------------------------------+-----------------------------------+ ### **Question 27** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | In aerobic respiration, glucose | | | is broken down during what step? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------ | | | Correct Answer: Glycolysis | | | ----------------- ------------ | +-----------------------------------+-----------------------------------+ ### **Question 28** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | What are the products of Krebs | | | cycle from one molecule of | | | pyruvate? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | --------------------------------- | | | - | | | Correct Answer: 3 NADH, 1 FAD | | | H~2~, 1 ATP, and carbon dioxide. | | | ----------------- ------------- | | | --------------------------------- | | | - | +-----------------------------------+-----------------------------------+ ### **Question 29** 1 out of 1 points +-----------------------------------+-----------------------------------+ | | Aerobic respiration is an | | | \_\_\_\_\_\_\_\_\_\_\_\_ reaction | | | because it releases energy stored | | | in glucose. | +-----------------------------------+-----------------------------------+ | | ----------------- ----------- | | | Correct Answer: exergonic | | | ----------------- ----------- | +-----------------------------------+-----------------------------------+ ### **Question 30** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | What is the function of oxygen in | | | alcohol fermentation? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | --------------------------------- | | | ------------------------------ | | | Correct Answer: This is a tri | | | ck question because alcohol ferme | | | ntation does not use oxygen. | | | ----------------- ------------- | | | --------------------------------- | | | ------------------------------ | +-----------------------------------+-----------------------------------+ ### **Question 31** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Wine, beer, and other alcoholic | | | beverages are created through | | | alcohol fermentation by bacteria. | +-----------------------------------+-----------------------------------+ | | ----------------- ------- | | | Correct Answer: False | | | ----------------- ------- | +-----------------------------------+-----------------------------------+ ### **Question 32** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Which of the following pigments | | | is responsible for the light | | | dependent reactions of | | | photosynthesis in green plants? | +-----------------------------------+-----------------------------------+ | | +--------------+--------------+ | | | | Correct | e. | | | | | Answer: | | | | | | | both a and b | | | | +--------------+--------------+ | +-----------------------------------+-----------------------------------+ ### **Question 33** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Select all that apply: Which of | | | the following is a step in | | | photosynthesis? | +-----------------------------------+-----------------------------------+ | | Correct Answers: light depend | | | ent reaction | | | ------------------ ------------ | | | ---------------- | | | light indepe | | | ndent reaction | +-----------------------------------+-----------------------------------+ ### **Question 34** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | You are standing in the hot, dry | | | desert around Tucson, Arizona. | | | All around you are cacti in a | | | wide variety of shapes and sizes. | | | They use what type of carbon | | | fixation to do the | | | light-independent reactions of | | | photosynthesis? | +-----------------------------------+-----------------------------------+ | | ----------------- ----- | | | Correct Answer: CAM | | | ----------------- ----- | +-----------------------------------+-----------------------------------+ ### **Question 35** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | What is the reactant for the | | | Krebs Cycle? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------ | | | Correct Answer: Acetyl-CoA | | | ----------------- ------------ | +-----------------------------------+-----------------------------------+ ### **Question 36** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Which statement about | | | cholorplasts is not true? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | --------------------------------- | | | -------------------- | | | Correct Answer: The chloropla | | | st has a fluid-filled interior ca | | | lled the gastrula. | | | ----------------- ------------- | | | --------------------------------- | | | -------------------- | +-----------------------------------+-----------------------------------+ ### **Question 37** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | You are standing in the forests | | | of West Virginia, where the | | | sunlight is moderate and the | | | humidity is high.The trees in the | | | forest are using what type of | | | carbon fixation to do the | | | light-independent reactions of | | | photosynthesis? | +-----------------------------------+-----------------------------------+ | | ----------------- ---- | | | Correct Answer: C3 | | | ----------------- ---- | +-----------------------------------+-----------------------------------+ ### **Question 38** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Many bacteria and a few parasitic | | | animals are | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | because they cannot survive in | | | the presence of oxygen. | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | ------- | | | Correct Answer: obligate anae | | | robes | | | ----------------- ------------- | | | ------- | +-----------------------------------+-----------------------------------+ ### **Question 39** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | When sunlight first enters the | | | light dependent reaction, it | | | ejects 2 electrons from what | | | molecule? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | --- | | | Correct Answer: photosystem I | | | I | | | ----------------- ------------- | | | --- | +-----------------------------------+-----------------------------------+ ### **Question 40** 1 out of 1 points +-----------------------------------+-----------------------------------+ | | All of the oxygen used by animals | | | is produced by photosynthetic | | | plants and algae. | +-----------------------------------+-----------------------------------+ | | ----------------- ------ | | | Correct Answer: True | | | ----------------- ------ | +-----------------------------------+-----------------------------------+ ### **Question 41** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Where does glycolysis occur? | +-----------------------------------+-----------------------------------+ | | ----------------- ----------- | | | Correct Answer: cytoplasm | | | ----------------- ----------- | +-----------------------------------+-----------------------------------+ ### **Question 42** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Photosynthesis occurs in what | | | organelle? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | Correct Answer: chloroplast | | | ----------------- ------------- | +-----------------------------------+-----------------------------------+ ### **Question 43** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Which of the following statement | | | about the light independent | | | reaction is not true? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | -------- | | | Correct Answer: It releases o | | | xygen. | | | ----------------- ------------- | | | -------- | +-----------------------------------+-----------------------------------+ ### **Question 44** 1 out of 1 points +-----------------------------------+-----------------------------------+ | | Below is the equation for what | | | metabolic process? | | | | | | C~6~H~12~O~6~ + 6 O~2~ 6 CO~2~ + | | | 6 H~2~O | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | -------- | | | Correct Answer: aerobic respi | | | ration | | | ----------------- ------------- | | | -------- | +-----------------------------------+-----------------------------------+ ### **Question 45** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Below is the equation for what | | | metabolic process? | | | | | | 6 CO~2~ + 12 H~2~O C~6~H~12~O~6~ | | | + 6 O~2~ + 6 H~2~O | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | --- | | | Correct Answer: photosynthesi | | | s | | | ----------------- ------------- | | | --- | +-----------------------------------+-----------------------------------+ ### **Question 46** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | In aerobic respiration, carbon | | | dioxide, NADH and FADH~2~ are | | | produced during what step? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | Correct Answer: Krebs cycle | | | ----------------- ------------- | +-----------------------------------+-----------------------------------+ ### **Question 47** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | In aerobic respiration, water and | | | 32 ATP are produced during what | | | step? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | ----------------------- | | | Correct Answer: Electron tran | | | sport phosphorylation | | | ----------------- ------------- | | | ----------------------- | +-----------------------------------+-----------------------------------+ ### **Question 48** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Photosynthesis produces | | | carbohydrates that are the base | | | of the food chain. | +-----------------------------------+-----------------------------------+ | | ----------------- ------ | | | Correct Answer: True | | | ----------------- ------ | +-----------------------------------+-----------------------------------+ ### **Question 49** 1 out of 1 points +-----------------------------------+-----------------------------------+ | | Alcohol fermentation occurs in | | | muscle cells of animals. | +-----------------------------------+-----------------------------------+ | | ----------------- ------- | | | Correct Answer: False | | | ----------------- ------- | +-----------------------------------+-----------------------------------+ ### **Question 50** 1 out of 1 points +-----------------------------------+-----------------------------------+ | | The Krebs cycle occurs in what | | | organelle? | +-----------------------------------+-----------------------------------+ | | ----------------- ------------- | | | - | | | Correct Answer: mitochondria | | | ----------------- ------------- | | | - | +-----------------------------------+-----------------------------------+ ### **Question 51** 1 out of 1 points +-----------------------------------+-----------------------------------+ | | What molecule is split by | | | Photosystem II to gain the 2 | | | electrons it lost? | +-----------------------------------+-----------------------------------+ | | ----------------- ------- | | | Correct Answer: water | | | ----------------- ------- | +-----------------------------------+-----------------------------------+ ### **Question 52** 0 out of 1 points +-----------------------------------+-----------------------------------+ | | Select all that apply: Which of | | | the following is a step in | | | aerobic respiration? | +-----------------------------------+-----------------------------------+ | | Correct Answers: electron tra | | | nsport phosphorylation | | | ------------------ ------------ | | | ------------------------ | | | Krebs cycle | | | glycolysis | +-----------------------------------+-----------------------------------+ Thursday, October 31, 2024 8:41:27 AM EDT Wine, beer, and other alcoholic beverages are created through alcohol fermentation by bacteria. - True - False **Question 4**\ Below is the equation for what metabolic process?\ 6 CO₂ + 12 H₂O → C₆H₁₂O₆ + 6 O₂ + 6 H₂O - Photosynthesis - Lactate fermentation - Aerobic respiration - Ethanol fermentation **Question 5**\ The Krebs cycle occurs in what organelle? - Ribosomes - Nucleus - Mitochondria - Cytoplasm - Chloroplast **Question 6**\ All of the oxygen used by animals is produced by photosynthetic fungi and bacteria. - True - False **Question 7**\ How can molecules other than glucose enter aerobic respiration? - a\. They can be converted to glucose and enter glycolysis. - b\. They can be converted to pyruvate and enter the Krebs cycle. - c\. They can be broken down in the cytoplasm to generate FADH₂ and NADH. - d\. Both a and b - e\. It is a trick question because glucose is the only biomolecule that can be used as a source of energy. **Question 8**\ Humans are \_\_\_\_\_\_\_\_\_\_\_\_\_\_ because we require oxygen to survive. - Animals - Obligate anaerobes - Facultative anaerobes - Obligate aerobes - Plants **Question 9**\ When oxygen returns to the muscle cells, what happens to the lactic acid generated during anaerobic respiration? - It is converted to glucose and transported out of the cell. - Nothing. It builds up over time and eventually will kill the cell. - It is turned into alcohol and excreted by the cell. - It is converted back to pyruvate and enters the Krebs cycle. **Question 10**\ Many bacteria and a few parasitic animals are \_\_\_\_\_\_\_\_\_\_\_\_\_\_ because they cannot survive in the presence of oxygen. - Animals - Obligate aerobes - Plants - Facultative anaerobes - Obligate anaerobes And so on. If you\'d like the rest to follow, let me know! 4o ##### **You said:** Answer all ###### **ChatGPT said:** ChatGPT Here are the answers: - **Question 1** - Below is the equation for what metabolic process? - C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O - **Answer: Aerobic respiration** - **Question 2** - Which of the following statements about the light-independent reaction is not true? - **Answer: It releases oxygen.** - **Question 3** - Wine, beer, and other alcoholic beverages are created through alcohol fermentation by bacteria. - **Answer: False** - **Question 4** - Below is the equation for what metabolic process? - 6 CO₂ + 12 H₂O → C₆H₁₂O₆ + 6 O₂ + 6 H₂O - **Answer: Photosynthesis** - **Question 5** - The Krebs cycle occurs in what organelle? - **Answer: Mitochondria** - **Question 6** - All of the oxygen used by animals is produced by photosynthetic fungi and bacteria. - **Answer: False** - **Question 7** - How can molecules other than glucose enter aerobic respiration? - **Answer: d. Both a and b** - **Question 8** - Humans are \_\_\_\_\_\_\_\_\_\_\_\_\_\_ because we require oxygen to survive. - **Answer: Obligate aerobes** - **Question 9** - When oxygen returns to the muscle cells, what happens to the lactic acid generated during anaerobic respiration? - **Answer: It is converted back to pyruvate and enters the Krebs cycle.** - **Question 10** - Many bacteria and a few parasitic animals are \_\_\_\_\_\_\_\_\_\_\_\_\_\_ because they cannot survive in the presence of oxygen. - **Answer: Obligate anaerobes** - **Question 11** - You are standing in the hot, dry desert around Tucson, Arizona. All around you are cacti in a wide variety of shapes and sizes. They use what type of carbon fixation to do the light-independent reactions of photosynthesis? - **Answer: CAM** - **Question 12** - Select all that apply: Which of the following is a step in aerobic respiration? - **Answer: Electron transport phosphorylation, Glycolysis, Krebs cycle** - **Question 13** - What is the function of oxygen in aerobic respiration? - **Answer: It is the final acceptor of electrons and H+ in the electron transport phosphorylation.** - **Question 14** - How many ATP are produced from one glucose molecule in anaerobic respiration? - **Answer: 2** - **Question 15** - Why did organisms need to evolve a way to deal with free oxygen in the atmosphere? - **Answer: Oxygen is highly reactive, reacting with metals, organic molecules, and creating free radicals that damage tissues.** - **Question 16** - Which statement about chloroplasts is not true? - **Answer: The chloroplast has a fluid-filled interior called the gastrula.** - **Question 17** - All of the oxygen used by animals is produced by photosynthetic plants and algae. - **Answer: True** - **Question 18** - Which of the following organisms undergo cellular respiration to release energy from organic matter? - **Answer: All of the above** - **Question 19** - What are the products of glycolysis? - **Answer: Two pyruvate molecules, 2 NADH, and 2 ATP (net).** - **Question 20** - In aerobic respiration, glucose is broken down during what step? - **Answer: Glycolysis** - **Question 21** - Which of the following pigments is responsible for the light-dependent reactions of photosynthesis in green plants? - **Answer: e. Both a and b** - **Question 22** - Photosynthesis produces carbohydrates that are the base of the food chain. - **Answer: True** - **Question 23** - A(n) \_\_\_\_\_\_\_\_\_\_\_\_\_\_ is a molecule that absorbs light. - **Answer: Pigment** - **Question 24** - After 2 electrons are ejected from Photosystem I, which of the following reactions occurs? - **Answer: NADP+ is reduced by adding an H+ to it.** - **Question 25** - In photosynthesis, glucose is produced during what step? - **Answer: Light independent reaction** - **Question 26** - Before it enters the Krebs cycle, what has to happen to the pyruvate molecule? - **Answer: e. Both a and c** - **Question 27** - During photosynthesis, energy from the electron transport chain is used to pump what ion into the thylakoid compartment? - **Answer: H+** - **Question 28** - What molecule is split by Photosystem II to gain the 2 electrons it lost? - **Answer: Water** - **Question 29** - In aerobic respiration, water and 32 ATP are produced during what step? - **Answer: Electron transport phosphorylation** - **Question 30** - Select all that apply: Which of the following is a step in photosynthesis? - **Answer: Light dependent reaction, Light independent reaction** - **Question 31** - You are standing in the forests of West Virginia, where the sunlight is moderate and the humidity is high. The trees in the forest are using what type of carbon fixation to do the light-independent reactions of photosynthesis? - **Answer: C3** - **Question 32** - Where does glycolysis occur? - **Answer: Cytoplasm** - **Question 33** - Which of the following plants is a CAM plant? - **Answer: Cactus** - **Question 34** - What are the products of the Krebs cycle from one molecule of pyruvate? - **Answer: 3 NADH, 1 FADH2, 1 ATP, and carbon dioxide.** - **Question 35** - Why are plants green? - **Answer: e. Both c and d** - **Question 36** - When sunlight first enters the light-dependent reaction, it ejects 2 electrons from what molecule? - **Answer: Photosystem II** - **Question 37** - What are the products of the electron transport phosphorylation? - **Answer: Water and 32 ATP** - **Question 38** - What are stomata? - **Answer: Pores in the underside of leaves that open to allow CO2 in and O2 out.** - **Question 39** - You are standing in the grasslands of Kansas. It is hot with moderate levels of humidity. Most of the plants are using \_\_\_\_\_\_\_\_\_\_\_\_\_ type of carbon fixation to do the light-independent reactions of photosynthesis because it results in less water-loss under these conditions than C3. - **Answer: C4** - **Question 40** - In aerobic respiration, carbon dioxide, NADH, and FADH2 are produced during what step? - **Answer: Krebs cycle** - **Question 41** - Aerobic respiration results in more ATP production than anaerobic respiration. - **Answer: True** - **Question 42** - Which statement about photosynthesis is not true? - **Answer: Photosynthesis takes place in the mitochondria of the cell.** - **Question 43** - Yeast and some bacteria are \_\_\_\_\_\_\_\_\_\_\_\_\_\_ because they can live with or without oxygen. - **Answer: Facultative anaerobes** - **Question 44** - What is the source of all oxygen in the atmosphere? - **Answer: Photosynthesis** - **Question 45** - Lactate fermentation occurs in the muscle cells of animals when oxygen is absent but they need to keep working. - **Answer: True** - **Question 46** - Aerobic respiration is an \_\_\_\_\_\_\_\_\_\_\_\_ reaction because it releases energy stored in glucose. - **Answer: Exergonic** - **Question 47** - Why is the visible light spectrum a narrow section of the entire electromagnetic spectrum between 400 and 700 nm and not higher or lower? - **Answer: It is the part of the spectrum that has enough energy to excite electrons in pigment molecules but low enough not to damage tissue.** - **Question 48** - What is the reactant for the Krebs Cycle? - **Answer: Acetyl-CoA** - **Question 49** - What are the end products of photosynthesis? - **Answer: Glucose and oxygen** - **Question 50** - What is the function of oxygen in alcohol fermentation? - **Answer: This is a trick question because alcohol fermentation does not use oxygen.** - **Question 51** - Alcohol fermentation occurs in muscle cells of animals. - **Answer: False** - **Question 52** - Photosynthesis occurs in what organelle? - **Answer: Chloroplast** -