Which of the following is a major problem for animals that live in hyperosmotic environments?
A) preventing heat loss
B) access to mineral nutrients
C) preventing water loss
D) obtaining enough oxygen
C
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What must occur before a glucose molecule can be broken down to release energy?
a. One ATP molecule must phosphorylate the six carbon sugar. b. Two ATP molecules must phosphorylate the six carbon sugar. c. Three ATP molecules must phosphorylate the six carbon sugar. d. One ATP molecule must be taken away from glucose. e. Two ATP molecules must be taken away from glucose.
The posterior pituitary secretions produce their effects
a. on the gonads. b. in the thyroid glands. c. on adrenal glands. d. on mammary glands. e. on thirst mechanism.
Feedback inhibition is a type of allosteric regulation in which a molecule binds to _______ and inhibits its _______.
a. a site on an enzyme distinct from the catalytic site; activity b. a site on an enzyme distinct from the catalytic site; synthesis c. the catalytic site on an enzyme; activity d. the mRNA for an enzyme; synthesis
The primary producers for hydrothermal vent ecosystems are
A. chemoautotrophs. B. chemoheterotrophs. C. phytoplankton. D. cyanobacteria. E. algae.