AP Biology Unit 3 Review

Where does the carbon come from that is used to form glucose in photosynthesis?

• The soil

• CO₂ in the air

• From other carbohydrates

• Calvin Cycle

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During which phase of photosynthesis is G3P synthesized?

• Photosystem II

• Light Reaction

• Calvin Cycle

• Glycolysis

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Where does the Calvin cycle take place?

• stroma of the chloroplast

• thylakoid membrane

• outer membrane of the chloroplast

• interior of the thylakoid membrane

What is the primary function of the Calvin cycle?

• regenerate ATP for use in the light reactions of photosynthesis
• produce carbon dioxide for use in the light reactions of photosynthesis
• produce oxygen by oxidizing water
• produce simple sugars from carbon dioxide

Photosynthesis goal is to

• convert light energy into glucose energy

• use light energy to make oxygen gas

• convert sugar energy into ATP

• convert sugar energy into oxygen gas

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If the proton (H+) pump in the thylakoid was not working which molecule could not be made during the light reaction?

• NADPH

• ATP

• Water

• Oxygen gas

Which process is the largest contributor to the release of CO₂ 

• Krebs Cycle

• Pyruvate Oxidation

• Glycolysis

• Oxidative Phosphorylation 

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What is the main job of the electron carriers in cellular respiration? 

• Transport electrons and hydrogen atoms to the electron transport chain 

• Capture energy throughout the process of cellular respiration

• Provide the reactants for the process of cellular respiration

• Pump positive hydrogen ions and shuttle electrons across the electron transport chain and contribute to chemiosmosis

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Glucose is broken down into pyruvate in a process known as 

• glycolysis

• electron transport

• the Krebs cycle

• phosphorylation

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A weightlifter is using heavy weights in short bursts for a competition. Because his muscle cells are not able to take in enough oxygen to make very much ATP the weightlifter begins to get fatigue in his muscles. Which of the following processes is most likely going on in the muscles of the weightlifter as he competes in his event?

• As the cells run out of oxygen they switch to anaerobic respiration (fermentation), which allows the cell to make small amounts of ATP in the absence of oxygen.

• As the cells run out of oxygen, they die off gradually and the weightlifter's muscles have fewer contracting muscle cells.

• The cells will never run out of oxygen if the weightlifter is breathing.

• As the cells run out of oxygen, they will continue to make the same amount of ATP, since oxygen is not required to make ATP.

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