PROBLEM SET More challenging problems are marked with a . 11-1 True, False, or I

Question

PROBLEM SET More challenging problems are marked with a . 11-1 True, False, or Insufficient Information. Indicate whether each of the following statements is true (T), false (F), or does not provide enough information for you to make a decision (I). (a) Sucrose is synthesized in the chloroplast stroma and reduced carbon for nonphotosynthetic plant cells. exported from photosynthetic cells to provide energy and (b) Ninety percent of the solar energy collected by a photosystem complex is absorbed when photons strike a special pair of chlorophyll molecules at the reaction center of the complex. (c) The energy requirement expressed as ATP consumed per molecule of carbon dioxide fixed is higher for a C3 plant (d) The ultimate electron donor for the photosynthetic genera (e) The enzyme rubisco is unusual in that, depending on condi- than for a C4 plant. tion of NADPH is always water. tions, it exhibits two different enzymatic activities.

Explanation / Answer

Answer a:- False. Sucrose is not synthesized in the chromoplast stroma it is synthesized in the cytosol around the chloroplast.

Answer b. False. There are no special pair of chlorophyll molecules in the complex. Photons strike the electrons of photosystem I and II and excite them.

Answer c. False. A C3 plant uses 18 ATPs and a C4 plant uses 30 ATPs.

Answer d. False. In case of oxygenic photosynthesis water is the ultimate donor but In case of anoxygenic photosynthesis sulfide and other compounds are the electron donors. So water is not always the electron donor.

Answer e. True. Rubisco can catalyse a reaction with ribulose 1, 5 bisphospate and carbon dioxide and ribulose 1, 5 bisphospate and oxygen too. So it favors carboxylation and oxygenation both.

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