1. Glucose breakdown is ____.
A) an endergonic reaction proceeding from low-energy molecules to high-energy molecules
B) coupled with ATP breakdown
C) combined with carbon dioxide to form oxygen plus water
D) an oxidation-reduction reaction
E) the removal of electrons from O2 that are eventually received by substrates
2. Which of the following molecules will diffuse out of the cell, enter the bloodstream, and be released from the lungs during aerobic cellular respiration?
A) oxygen
B) carbon dioxide
C) ATP
D) water
E) glucose
3. Which pathway for aerobic cellular respiration is located in the cytoplasm of the cell?
A) glycolysis
B) Krebs cycle
C) electron transport system
D) transition reaction
E) Calvin cycle
4. During aerobic cellular respiration, which molecule originates from the digestive system?
A) oxygen
B) carbon dioxide
C) ATP
D) water
E) glucose
5. Which of the following statements is NOT correct regarding aerobic cellular respiration?
A) Cells would lose too much energy as heat if they used glucose directly for individual reactions.
B) Cells would lose too much energy as nonusable heat if they used glucose directly.
C) Cells are able to utilize all the energy from glucose when released in one burst.
D) Gradual glucose breakdown releases energy slowly.
E) Gradual glucose breakdown allows for the simultaneous buildup of many ATP molecules.
6. Which of the following pathways does NOT occur in aerobic cellular respiration?
A) glycolysis
B) Krebs cycle
C) electron transport system
D) transition reaction
E) Calvin cycle
7. The carriers for the electron transport system are located ______.
A) within the cytoplasm of a cell
B) on the cristae of mitochondria
C) within the matrix of mitochondria
D) within the Golgi apparatus
E) within the stroma of chloroplasts
8. Which of the following statements about aerobic cellular respiration in the human body is NOT correct?
A) Glucose and oxygen are delivered to the cells by the bloodstream.
B) Carbon dioxide and water are removed from the cells by the bloodstream.
C) Water can remain in the cell or leave as needed.
D) ATP remains in the cytoplasm as a source of energy for the cell to do work.
E) In mitochondria, glucose is broken down to carbon dioxide and water as ATP is produced.
9. Which coenzyme is used in cellular respiration?
A) NAD+
B) NADP
C) niacin
D) alcohol dehydrogenase
E) cytochrome oxidase
10. Which of the following statements is correct?
A) NAD is reduced and becomes NADH2 when it accepts hydrogen atoms.
B) NAD is oxidized and becomes NADH when it accepts hydrogen atoms.
C) NAD is reduced and becomes NADH2 when it releases hydrogen atoms.
D) NADH2 is reduced to NAD when the hydrogen atoms are passed to another acceptor.
11. Which of the following statements is NOT true about NAD?
A) Only a small amount of NAD is needed in cells.
B) NAD can only be used once before it must be resynthesized.
C) NAD can accept hydrogen atoms and is reduced to NADH2.
D) NADH2 can carry the hydrogen atoms to another acceptor, becoming oxidized to NAD again.
E) NAD is involved in cellular respiration.
12. Which of the following statements is NOT correct about glycolysis?
A) Glycolysis takes place within the cytoplasm.
B) Glycolysis uses two ATP but forms four ATP, resulting in a net gain of two ATP molecules.
C) During glycolysis, two NADH are produced as substrate oxidation occurs.
D) Glycolysis begins with glucose and ends with four pyruvate molecules.
13. Pyruvate is the end product of the ______ reactions.
A) Krebs cycle
B) Calvin cycle
C) electron transport system
D) glycolysis
E) transition
14. Glycolysis can be used in both aerobic cellular respiration and fermentation.
A) True
B) False
15. Which of the following statements about the transition reaction is NOT correct?
A) It occurs in the matrix of mitochondria.
B) It links glycolysis to the Krebs cycle.
C) Two oxygen molecules are given off from glucose.
D) Two pyruvate molecules become two acetyl-CoA molecules.
E) Two NADH molecules are formed from the reaction.