Photosynthesis End of Chapter

Question 1

The light reactions of photosynthesis supply the Calvin cycle with

a. light energy.
b. CO2 and ATP.
c. H2O and NADPH.
d. ATP and NADPH

Answer 1

ATP and NADPH.

Question 2

2. Which of the following sequences correctly represents the flow of electrons during photosynthesis?
   a. NADPH —> O2 —> CO2
   b. H2O –> NADPH –>Calvin cycle
   c. H2O –>photosystem I –>photosystem II
   d. NADPH –>electron transport chain –>O2

Answer 2

H₂O → NADPH → Calvin cycle

Question 3

3. How is photosynthesis similar in C4 plants and CAM plants?
   a. In both cases, only photosystem I is used.
   b. Both types of plants make sugar without the Calvin cycle. c. In both cases, rubisco is not used to fix carbon initially.
   d. Both types of plants make most of their sugar in the dark

Answer 3

In both cases, rubisco is not used to fix carbon initially.

Question 4

4. Which of the following statements is a correct distinction between autotrophs and heterotrophs?
   a. Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic.
   b. Only heterotrophs require chemical compounds from the environment
   . c. Cellular respiration is unique to heterotrophs.
   d. Only heterotrophs have mitochondria.

Answer 4

Autotrophs, but not heterotrophs, can nourish themselves beginning with CO₂ and other nutrients that are inorganic.

Question 5

5. Which of the following does not occur during the Calvin cycle?
   a. carbon fixation
   b. oxidation of NADPH
   c. release of oxygen
   d. regeneration of the CO2 acceptor

Answer 5

release of oxygen

Question 6

6. In mechanism, photophosphorylation is most similar to a. substrate-level phosphorylation in glycolysis. b. oxidative phosphorylation in cellular respiration. c. carbon fixation. d. reduction of NADP+.

Answer 6

oxidative phosphorylation in cellular respiration.

Question 7

7. Which process is most directly driven by light energy? a. creation of a pH gradient by pumping protons across the thylakoid membrane b. reduction of NADP+ molecules c. removal of electrons from chlorophyll molecules d. ATP synthesis

Answer 7

removal of electrons from chlorophyll molecules