Photosynthesis and Leaf Structure

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Questions and Answers

Which molecule is produced as a byproduct of both lactic fermentation and alcoholic fermentation?

  • Carbon Dioxide (correct)
  • Acetyl CoA
  • Oxygen
  • NADH

What is the primary role of acetyl CoA in the Krebs cycle?

  • To lose a carbon molecule and produce energy
  • To enter the Krebs cycle as a six-carbon molecule (correct)
  • To act as an electron carrier
  • To be converted into lactate

Where does glycolysis occur in a eukaryotic cell?

  • In the nucleus
  • In the cytoplasm (correct)
  • In the mitochondrial matrix
  • On the inner mitochondrial membrane

Which statement correctly describes pyruvate during respiration?

<p>Pyruvate can be converted into lactate or ethanol during fermentation. (C)</p> Signup and view all the answers

What are the inputs required for the Krebs cycle?

<p>Acetyl CoA and Water (C)</p> Signup and view all the answers

What is the primary function of the cuticle in leaf structure?

<p>To protect the leaf from water loss (B)</p> Signup and view all the answers

Which component of the leaf structure is primarily responsible for gas exchange?

<p>Stoma (C)</p> Signup and view all the answers

What are the outputs of the light-dependent reactions of photosynthesis?

<p>O2, ATP, NADPH (C)</p> Signup and view all the answers

What compound is formed when electrons from the light-dependent reactions bond with H+ and NADP+?

<p>NADPH (A)</p> Signup and view all the answers

Which statement best describes the role of ATP synthase in photosynthesis?

<p>It makes ATP by moving H+ ions up the concentration gradient. (C)</p> Signup and view all the answers

What is the chemical formula for photosynthesis?

<p>6CO2 + 6H2O → C6H12O6 + 6O2 (D)</p> Signup and view all the answers

What is the main purpose of cellular respiration?

<p>To convert glucose into chemical energy (B)</p> Signup and view all the answers

During photosynthesis, which part of the leaf primarily contains chloroplasts?

<p>Palisade mesophyll (B)</p> Signup and view all the answers

What is the primary function of the electron transport chain?

<p>To generate ATP through oxidative phosphorylation (B)</p> Signup and view all the answers

What is the result of fermentation in the absence of oxygen?

<p>Conversion of pyruvate to ethanol and CO2 (A)</p> Signup and view all the answers

Which molecule acts as the final electron acceptor in the electron transport chain?

<p>O2 (B)</p> Signup and view all the answers

How many total ATP can be generated from one molecule of glucose during cellular respiration?

<p>38 ATP (A)</p> Signup and view all the answers

Where does ATP synthesis occur within the mitochondria?

<p>Inner membrane (C)</p> Signup and view all the answers

During the Krebs cycle, what do FAD and NAD+ become after accepting electrons?

<p>FADH2 and NADH (A)</p> Signup and view all the answers

What happens to the 4 carbon molecule in the Krebs cycle?

<p>It regenerates to continue the cycle (D)</p> Signup and view all the answers

How does the open tube in the yeast demo behave compared to the closed tube?

<p>It quickly turns yellow from CO2 production (C)</p> Signup and view all the answers

Flashcards

Photosynthesis

The process of converting light energy from the sun into chemical energy (glucose).

Leaf Structure

The arrangement of parts in a leaf, including the cuticle, mesophyll (palisade and spongy), veins (xylem & phloem), and stomata.

Chlorophyll

The green pigment in chloroplasts that absorbs sunlight for photosynthesis.

Light-dependent Reactions

The first stage of photosynthesis, converting light energy into chemical energy in the form of ATP and NADPH.

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Light-independent Reactions

The second stage of photosynthesis (Calvin Cycle), where CO2 is used to build glucose.

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Cellular Respiration

The process of breaking down glucose to release energy in the presence of oxygen.

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Electron Transport Chain

A series of protein complexes that transfer electrons, generating ATP in photosynthesis and cellular respiration.

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Photosynthesis Formula

6CO2 + 6H2O → C6H12O6 + 6O2 (Carbon dioxide + Water → Glucose + Oxygen)

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Cellular Respiration Inputs

The molecules that are used as fuel for cellular respiration, providing the energy to produce ATP.

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Cellular Respiration Outputs

The products released after the breakdown of glucose during cellular respiration.

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Glycolysis Location

The specific location within the cell where glycolysis occurs.

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Krebs Cycle Location

The specific location within the cell where the Krebs cycle takes place.

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Electron Transport Chain Location

The specific location within the cell where the electron transport chain occurs.

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What is cellular respiration?

The process by which cells break down glucose to release energy in the form of ATP. It occurs in the presence of oxygen and involves four main stages: glycolysis, the Krebs cycle, the electron transport chain, and oxidative phosphorylation.

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Where does glycolysis occur?

Glycolysis occurs in the cytoplasm of the cell.

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Krebs Cycle

A series of chemical reactions in the mitochondria that breaks down pyruvate, producing ATP, NADH, and FADH2.

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What is the role of NADH and FADH2 in cellular respiration?

NADH and FADH2 are electron carriers that pick up electrons from glycolysis and the Krebs cycle and transfer them to the electron transport chain.

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What is fermentation?

An anaerobic process that occurs when oxygen is unavailable, allowing cells to produce a small amount of ATP by converting pyruvate into lactate or ethanol.

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What is the difference between aerobic and anaerobic respiration?

Aerobic respiration requires oxygen and produces a large amount of ATP, while anaerobic respiration occurs without oxygen and produces a much smaller amount of ATP.

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What is the final electron acceptor in the electron transport chain?

Oxygen (O2) is the final electron acceptor in the electron transport chain, combining with electrons and protons to form water.

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Study Notes

Photosynthesis

  • Leaf Structure: The leaf's structure plays a key role in photosynthesis. Protective cuticle, upper and lower epidermis, palisade mesophyll (with high chlorophyll content), and spongy mesophyll (with more chloroplasts) are important. Veins, containing xylem (for water transport) and phloem (transporting sugars from the leaf), are crucial.
  • Chloroplasts and Chlorophyll: Chloroplasts, found in palisade and spongy mesophyll cells, are the site of photosynthesis. Chlorophyll, the green pigment, is essential.
  • Photosynthesis Process: Photosynthesis converts light energy into energy-rich molecules like glucose. The overall chemical equation is 6CO2 + 6H2O → C6H12O6 + 6O2. This process involves gas exchange, with carbon dioxide entering and oxygen and water vapor leaving the leaf via stomata.

Light-Dependent Reactions

  • Inputs: Water (H₂O), sunlight, ADP, and NADP⁺ are required for these reactions.
  • Process Details: Photosystem II absorbs sunlight, splitting water into H⁺, O₂, and electrons. Electrons travel through electron carriers, increasing their energy level creating ATP and NADPH. Oxygen (O₂) exits the plant through stomata, H⁺ accumulate in the thylakoid space.
  • Outputs: ATP, NADPH, and Oxygen (O₂) are generated during these reactions.

Light-Independent Reactions/Calvin Cycle

  • Inputs: ATP, NADPH, CO₂.
  • Process Details: Uses energy from ATP and NADPH to convert carbon dioxide (CO₂) into glucose. The process occurs in the stroma (the fluid portion of the chloroplast).

Cellular Respiration

  • Definition: The process of converting high-energy molecules (glucose) into chemical energy (ATP).
  • Inputs: Glucose, Oxygen
  • Outputs: Water (H₂O), ATP, Carbon Dioxide (CO₂). this is opposite to photosynthesis.

Glycolysis

  • Definition: The breakdown of glucose into pyruvate.
  • Where it occurs: cytoplasm
  • Process Details: Glucose is converted to two pyruvate molecules, producing 2 ATP and 2 NADH.

Krebs Cycle

  • Definition: A series of chemical reactions to release energy from acetyl CoA.
  • Where it occurs: mitochondrial matrix

Electron Transport Chain

  • Definition: A process where electrons move through electron carriers, generating ATP.
  • Where it occurs: inner mitochondrial membrane
  • Process Details: The electrons are passed down and the energy is used to make ATP

Fermentation

  • Definition: Energy production process without oxygen.
  • Types: Lactic fermentation, alcoholic fermentation.
  • Process Details (Lactic): Pyruvate converts to lactate, regenerating NAD+.
  • Process Details (Alcoholic): Pyruvate converts to ethanol and carbon dioxide, regenerating NAD⁺.

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