The most important pigment(s) for the process of photosynthesis is(are):
a. carotenoids.
b. chlorophyll a.
c. chlorophyll b.
d. chlorophyll c.
e. All of these are equally important for photosynthesis.
B
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Which one of the following would least likely be used during the initiation phase of translation?
A. elongation factors B. tRNA C. small ribosomal subunits D. initiation factors E. mRNA
Which of the following is a phototroph?
A) a tree B) a mushroom C) bacteria growing on decomposing matter D) an earthworm E) a person
Most of the energy within an ecosystem is lost
a. when organisms disperse. b. when organisms die. c. as a result of metabolism. d. by organisms at the top of the food web. e. by organisms at the bottom of the food web.
It's your birthday and you splurge with a big slice of chocolate cake, heavy on the icing. Shortly afterwards, your blood glucose levels rise until an endocrine mechanism (secretion of insulin) counteracts this rise and glucose levels decline. The initial change in blood glucose and insulin response that follows is an example of:
A. diffusion. B. positive feedback. C. homeostasis. D. lack of homeostasis. E. physiological constancy.