Bacteriorhodopsin is a light-sensitive pigment found
in _________ archaeans and used to supply energy
for __________. production.
a. halophilic; ATP
b. thermophilic; carbohydrate
c. methanogenic; methane
d. halophilic; carbohydrate
e. thermophilic; ATP
Answer: a
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Most of the water vapor in the earth's atmosphere comes from evaporation from
a. lakes. b. rivers. c. land. d. oceans. e. plants.
Which of the following chemicals' concentration is NOT increased by an elevation in metabolic activity?
A) carbon dioxide B) oxygen C) hydrogen D) potassium E) pyruvic acid
Tubular reabsorption occurs when most of the fluid and solutes move back into the ________
Fill in the blank(s) with correct word
Why do sex hormones and other steroids take much longer to produce their effects than nonsteroid hormones do?
A) Steroids are bigger, slower molecules. B) Steroids must usually be carried longer distances by the blood. C) Steroids must relay their messages via relay molecules. D) Steroids cause target cells to make new proteins, which takes time.