P680+ is said to be the strongest biological oxidizing agent. Given its function, why is this necessary?
A) It is the receptor for the most excited electron in either photosystem of photosynthesis.
B) It is the molecule that transfers electrons to plastoquinone (Pq) of the electron transfer system.
C) It transfers its electrons to reduce NADP+ to NADPH.
D) It obtains electrons from the oxygen atom in a water molecule, so it must have a stronger attraction for electrons than oxygen has.
D
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You would expect essentially no transpiration to occur in conditions of ____
a. brisk winds b. 100 percent relative humidity c. no winds d. one percent relative humidity e. hot air temperature and no winds
Plants are considered to be:
a. heterotrophs. b. chemotrophs. c. carbotrophs. d. autotrophs. e. a combination of all of these
If a woody plant in dormancy is placed in a
greenhouse so that only one limb is exposed to the cold winter temperatures, eventually the a. whole plant breaks dormancy and starts growing. b. parts of the plant that were inside the greenhouse start blooming. c. limb exposed to the low temperature dies. d. limb exposed to the low temperature breaks dormancy. e. limb exposed to the low temperature never forms seeds.
Which of the following statements is false regarding the characteristics of Rickettsias?
A. They are obligate intracellular parasites. B. They are the cause of Rocky Mountain Spotted Fever. C. They belong to class Alphaproteobacteria. D. They use glucose as an energy source.