Biology Exam #2

In green plant photosynthesis, water is A. oxidized to oxygen gas (O2) in the light. B. reduced to hydrogen gas. C. used to hydrolyze ATP. D. oxidized to O2 in the dark. E. an electron acceptor.

A

Photorespiration takes place in A. mitochondria, chloroplasts and peroxisomes B. chloroplasts and mitochondria C. the lysosomes. D. the microbodies. E. the cytoplasm and peroxisomes

A

Which of the following statements concerning the Calvin cycle is false? A. Light energy is not required for the cycle to proceed. B. CO2 is assimilated into sugars. C. RuBP is regenerated. D. It uses energy stored in ATP and NADPH + H+. E. All of the above are false.

A

ATP is produced during the light reactions via A. CO2 fixation. B. chemiosmosis. C. reduction of water. D. glycolysis. E. noncyclic electron flow from photosystem I

B

During photorespiration, rubisco uses _______ as a substrate. A. CO2 B. O2 C. glyceraldehyde 3-phosphate D. 3-phosphoglycerate E. NADPH

B

Cyclic electron transport A. involves photosystem II. B. results in the formation of NADPH. C. results in the formation of ATP. D. requires the oxidation of water. E. does not use the electron transport chain between the two photosystems.

C

Plants give off O2 because A. O2 results from the incorporation of CO2 into sugars. B. they do not respire; they photosynthesize. C. water is the initial electron donor, leaving O2 as a photosynthetic by-product. D. electrons moving down the electron chain bind to water, releasing O2. E. O2 is synthesized in the Calvin cycle.

C

The Calvin cycle results in the production of A. glucose. B. starch. C. rubisco. D. G3P. E. ATP.

D

The first phase of photosynthesis, a series of reactions that requires the absorption of photons to form ATP and NADPH, is referred to as the _______ phase. A. reduction B. dark reactions C. carbon fixation D. light reactions E. None of the above

D

Chlorophyll is suited for the capture of light energy because A. certain wavelengths of light raise it to an excited state. B. in its excited state it gives off electrons. C. its structure allows it to attach to thylakoid membranes. D. it can transfer absorbed energy to another molecule. E. All of the above

E

Which of the following statements regarding the relationship between photosynthesis and cellular respiration in plants is true? A. Photosynthesis occurs in specialized photosynthetic cells. B. Cellular respiration occurs in specialized respiratory cells. C. Cellular respiration and photosynthesis can occur in the same cell. D. Photosynthesis is limited to specialized plant cells and cellular respiration does not occur in plant cells. E. Both a and c

E