Which statement describes the functioning of photosystem II?
A) Light energy excites electrons in the thylakoid membrane electron transport chain.
B) Photons are passed along to a reaction-center chlorophyll.
C) The P680 chlorophyll donates a pair of protons to NADP+, which is thus converted to NADPH.
D) The electron vacancies in P680+ are filled by electrons derived from water.
E) The splitting of water yields molecular carbon dioxide as a by-product.
Answer: D
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Which of the following is not true of whooping cough?
A. Secondary infections can occur during the convalescent phase. B. It is caused by a small, aerobic, gram-negative rod. C. Incubation period is 3-21 days. D. An uncontrollable cough occurs during the paroxysmal stage. E. Cold-like symptoms are common for the paroxysmal stage.
All deserts have which of the following in
common? a. low rainfall amounts b. uniformly high temperature c. sand d. sparse vegetation e. large leafy plants
Rhizomes, tubers, corms, and stolons are examples of modified:a
leaves. b. flowers. c. roots. d. bulbs. e. stems.
All organisms that photosynthesize fit into which nutritional category?
A) mixotroph B) heterotrophs C) autotrophs D) parasites