Question

1. in cellular respiration, carbon dioxide is produced as a by - product of what process?

a. the citric acid cycle
b. electron transport
c. photosynthesis
d. glycolysis

1. which step of cellular respiration yields the most atp?

a. electron transport
b. glycolysis
c. the citric acid cycle
d. fermentation

1. oxygen is most directly important in which stage(s) of aerobic respiration?

a. glycolysis
b. electron - transport chain
c. a and c, but not b
d. the citric acid cycle

1. what by - product of cellular respiration is required for photosynthesis?

a. oxygen
b. nitrates
c. carbon dioxide
d. glucose

1. what by - product of photosynthesis is required for cellular respiration?

a. nitrates
b. oxygen
c. carbon dioxide
d. glucose

1. fermentation occurs in cells in the absence of:

a. water.
b. oxygen.
c. carbon dioxide.
d. glucose.

1. the final product of fermentation in humans is __________ and is linked to muscle fatigue and soreness.

a. acetic acid.
b. pyruvate.
c. lactic acid.
d. glucose.

Explanation:

1. In cellular respiration, carbon - dioxide is produced in the citric acid cycle.
2. The electron - transport chain yields the most ATP in cellular respiration.
3. Oxygen is most directly important in the electron - transport chain of aerobic respiration.
4. Carbon dioxide, a by - product of cellular respiration, is required for photosynthesis.
5. Oxygen, a by - product of photosynthesis, is required for cellular respiration.
6. Fermentation occurs in the absence of oxygen.
7. The final product of fermentation in humans is lactic acid, which is linked to muscle fatigue and soreness.

Answer:

1. b. the citric acid cycle
2. a. electron - transport
3. b. electron - transport chain
4. c. carbon dioxide
5. b. oxygen
6. b. oxygen
7. c. lactic acid