Unit 3 Test: Biomolecules and Matter Cycles Version A (25 Points) PDF

Name: ______________________________ Unit 3 Test: Biomolecules and Matter Cycles - Version A (25 Points) 1. Which of the following best describes how bacteria are involved in cycling matter within an ecosystem? a. Bacteria produce oxygen through photosynthesis, making it available to oth...

Name: ______________________________ Unit 3 Test: Biomolecules and Matter Cycles - Version A (25 Points) 1. Which of the following best describes how bacteria are involved in cycling matter within an ecosystem? a. Bacteria produce oxygen through photosynthesis, making it available to other organisms. b. Bacteria consume large amounts of organic matter, storing nutrients within their bodies. c. Bacteria decompose dead organisms, releasing nutrients back into the environment for other organisms to use. d. Bacteria directly absorb sunlight to convert inorganic matter into organic compounds. 2. Suppose a majority of the soil bacteria on a farm was significantly reduced in number by antibiotics/pesticides, what would most likely happen to the nitrogen available to plants? a. There would be no change in the available nitrogen. b. Nitrogen levels would increase due to the lack of bacteria consuming it. c. Nitrogen levels would significantly decrease as plants would have less accessible nitrogen. d. The impact on nitrogen levels would be minimal. 3. Which of the following shows the correct, balanced equation for photosynthesis a. CO2 + H2O → C6H12O6 + O2 b. 6CO2 + 6H2O → C6H12O6 + 6O2 c. C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP d. 6CO2 + 6H2O → C6H12O6 + 6O2 + ATP 4. Why are photosynthetic organisms (producers) considered the base of all ecosystems? a. They are the only organisms that can directly convert sunlight into usable energy through photosynthesis. b. They consume other organisms at the bottom of the food chain. c. They release carbon dioxide into the atmosphere, which is necessary for plant growth. d. They are the largest and most abundant organisms in an ecosystem. 5. Which of the following shows the correct, balanced equation for cellular respiration? a. CO2 + H2O → C6H12O6 + O2 b. 6CO2 + 6H2O → C6H12O6 + 6O2 c. 6CO2 + 6H2O → C6H12O6 + 6O2 + ATP d. C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP 6. What types of organisms produce energy through the process of cellular respiration? a. Producers b. Consumers c. Decomposers d. All of these 7. Which statement is true regarding cellular respiration? a. Only consumer organisms need to perform cellular respiration. b. Producers do not need to perform cellular respiration because they create their own food. c. All organisms, including producers, must carry out cellular respiration to generate energy. d. Cellular respiration is only necessary for animals to move around. 8. How does winter impact carbon cycling in lakes and ponds? a. A) cold temperatures increase the amount of nitrogen for photosynthesis b. B) snow increase the amount of water and the plants ability to photosynthesis c. C) low sunlight leads to less photosynthesis and lower oxygen d. D) there is less carbon dioxide produced in winter 9. Which statement best compares how aerobic and anaerobic respiration impact atmospheric carbon dioxide levels? a. Both aerobic and anaerobic respiration significantly increase atmospheric carbon dioxide levels, with anaerobic respiration contributing slightly more.  Name: ______________________________ b. Aerobic respiration significantly contributes to atmospheric carbon dioxide levels, while anaerobic respiration has a minimal impact. c. Anaerobic respiration significantly contributes to atmospheric carbon dioxide levels, while aerobic respiration has a minimal impact. d. Both aerobic and anaerobic respiration have a negligible impact on atmospheric carbon dioxide levels. ENZYME QUESTIONS: 10. Enzymes fit into which category of carbon-based biomolecules? a. Lipids b. Proteins c. Nucleic acids d. Carbohydrates 11. Which of the following is true of enzymes? a. They raise activation energy b. They are used up in reactions c. They have a specific function and structure d. They are made of lipids and carbohydrates 12. Which of the following is also true of enzymes? a. They are made of fatty acid chains b. They transform products into reactants c. They speed up some biological reactions d. They are used up in reactions like the decomposition of hydrogen peroxide 13. In the liver lab, a piece of 'used' liver caused fresh hydrogen peroxide to bubble. Which of the characteristics of enzymes does this demonstrate? a. Enzymes are reusable b. Enzymes are substrate specific c. Enzymes lower activation energy d. Enzymes speed up biological reactions 14. In the liver lab, a piece of liver decomposed hydrogen peroxide in much less time than the hydrogen peroxide was decomposed in a lighted room. Which characteristic of enzymes does this demonstrate? a. Enzymes are reusable b. Enzymes are substrate specific c. Enzymes lower activation energy d. Enzymes speed up biological reactions 11. 12. 13. 14. 15. 16. a. b.  Name: ______________________________ Question about increased atmospheric CO2 leading to increased rates of photosynthesis. 17. How does a consumer get nitrogen and what do they use it for? (2 pts) 1. Explain how organisms [ask for plant or animal] gain the reactants they need for cellular respiration. Match each biomolecule with its monomer and structure (??pts) Biomolecule Monomer Structure 1. Lipid _____, _____ A. fatty acid R. 2. Protein _____, _____ B. amino acid S. 3. Nucleic Acid _____, _____ C. nucleotide T. 4. Carbohydrate _____, _____ D. glucose U. a.