Energy Release and Conservation – Section 1

1. Organisms can synthesize ATP by oxidative phosphorylation when they

A. ferment
B. oxidize glucose to pyruvate
C. pass electrons from the oxidation of chlorophyll through an electron transport system
D. pass electrons to oxygen through an electron transport system containing cytochromes

Correct Answer: D. pass electrons to oxygen through an electron transport system containing cytochromes

2. How many molecules of carbon dioxide will be given off during ten turns of the Krebs cycle?

A. 10
B. 20
C. 30
D. 40

Correct Answer: B. 20

3. In cellular metabolism, O2 is used

A. to provide electrons for photophosphorylation
B. in glycolysis
C. as a terminal electron acceptor
D. in the Krebs cycle

Correct Answer: C. as a terminal electron acceptor

4. In glycolysis, ATP is created by

A. photophosphorylation
B. the chemiosmotic mechanism
C. substrate level phosphorylation
D. the pentose phosphate pathway

Correct Answer: C. substrate level phosphorylation

5. Suppose a eukaryotic cell had a mutation that prevented the production of cytochrome c. As a result of this mutation, which of the following processes would not occur?

A. Cellular respiration
B. Photosynthesis
C. Mitosis
D. Cell wall synthesis

Correct Answer: A. Cellular respiration

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