AP Bio Cell Respiration

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, 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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Which process takes place in the presence of oxygen and produces nearly 20 times as much as ATP as glycolysis alone?

• photosynthesis
• lactic acid fermentation
• aerobic respiration
• alcoholic fermentation

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Two different species of bacteria are examined. Scientists find that species X always produces CO₂ and H₂O during cellular respiration. Species Y always produces ethyl alcohol and CO₂. Which conclusion can be made from these observations?

• Only species Y is aerobic.
• Only species Y is anaerobic
• Both species X and Y are aerobic.
• Both species X and Y are anaerobic.

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What are the reactants in the equation for cellular respiration?

• oxygen and lactic acid
• carbon dioxide and water
• glucose and oxygen
• water and glucose

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Where does glycolysis occur?

• Inner mitochondrial membrane
• Mitochondrial Matrix
• Cytosol
• At a ribosome

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Glycolysis is a _______ process

• Anabolic
• Catabolic
• Single Step
• Strictly Eukaryotic

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NADH is a ______ form of NAD+.

• Reduced
• Oxidized
• Catabolized
• Hydrolized

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Which molecule enters Kreb's Cycle?

• Pyruvate
• Glucose
• Acetyl CoA
• reducing powers

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What enzyme in the ETC is responsible for generating the ATP molecules?

• ATPase
• ATP synthase
• Hexokinase
• none of the above

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Where does ETC occur?

• Mitochondrial matrix
• Outer mitochondrial membrane
• Inner mitochondrial membrane
• Cytosol