FREE BIOLOGY AND STUDY GAMES ABOUT AP BIO 9 10

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MC EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

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-Guarantee passing score -42 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: the primary role of oxygen in cellular respiration is to...

Answer:

act as an acceptor for electrons and hydrogen, forming water.

Question 2: Where are the proteins of the electron transport chain located?

Answer:

Mitochondrial inner membrane Question 3: In Chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP+ Pi to ATP?

Answer:

energy released from movement of protons through ATP synthase Question 4: What is the term for metabolic pathways that release stored energy by breaking down complex molecules?

Answer:

Catabolic Pathways

Question 5: The ATP made during fermentation is generated by which of the following?

Answer:

substrate-level phosphorylation Question 6: The figure shows the electron transport chain. Which of the following is the combination of substances that is initially added to the chain?

Answer:

NADH, FADH2 and electrons

Question 7: How does pyruvate enter the mitochondrion?

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active transport.Question 8: How many reduced dinucleotides would be produced with four turns of the citric acid cyle?

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• FADH2, and 12 NADH

Question 9: It is possible to prepare vesicles from portions of the inner membrane of the mitochondrial components. Which one of the following processes could still be carried on by this isolated inner membrane?

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oxidative phosphorylation Question 10: During aerobic respiration, which of the following directly donates electrons to the electron transport chain at the lowest level?

Answer:

FADH2

Question 11: Which of the following describes ubiquinone?

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a small hydrophobic coenzyme

Question 12: Inside an active mitochondrian, most electrons follow which pathway?

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citric acid cycle -> NADH -> electron transport chain -> oxygen Question 13: Approx. how many molecules of ATP are produced from the complete oxidation of two molecules of glucose in cellular respiration?

Answer:

76 Question 14: During cellular respiration, acetyl CoA accumulates in which location?

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mitochondrial matrix Question 15: After the first disruption, when electron transfer and ATP synthesize still occur, what must be present?

Answer:

all of the electron transport proteins as well as ATP synthase

Question 16: When a glucose molecule loses a hydrogen atom as the result of an

oxidation-reduction reaction, he molecule becomes...

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oxidized.Question 17: a young animal has never had much energy. He is brought to a veterinarian for help and is sent to the animal hospital for some tests. There they discover his mitochondria can use only fatty acids and amino acids for respiration, and his cells produce more

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His mitichondria lack the transport protein that moves pyruvate across the outer mitochondrial membrane.Question 18: For each molecule of glucose that is metabolized by glycolysis and the citric acid cycle, what is the total number of NADH + FADH2 molecules produced?

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12

Question 19: When of NAD+ gains a hydrogen atom the molecule becomes...

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reduced.

Question 20: What is proton-motive force?

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the transmembrane proton concentration gradient Question 21: Cellular rspiration harvests the most chemical energy from which of the following?

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Chemiosmotic phosphorylation Question 22: In glycolysis, for each molecule of glucose oxidized to pyruvate...

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• molecules of ATP are used and 4 molecules of ATP are produced.

Question 23: Why does the oxidation of organic compounds by molecular oxygen to produce CO2 and water release free energy?

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Electrons are being moved from atoms that have a lower affinity for electrons (such as

• to atoms with a higher affinity for electrons (such as O).

Question 24: The parts of the figure labled with Roman numerals sumbolize what concept?

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multimeric groups of proteins in 4 complexes

Question 25: An electron loses potential energy when it...

Answer:

shifts to a more electronegative atom.Question 26: Why is glycolysis described as having an investment phase and a payoff phase?

Answer:

It uses stored ATP and then forms a net in ATP.