Which is the most correct statement about the role of photosynthesis in an ecosystem?
a. Primary producers convert chemical energy to light energy.
b. Primary consumers rely directly on light energy.
c. Primary producers convert light energy to chemical energy as a service to the ecosystem,
not for their own gain.
d. Primary consumers rely on primary producers to make light energy available in a usable
form.
e. Primary producers are heterotrophs and thus make no contribution to the flow of energy
into the ecosystem.
D
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Which structure is an example of a tissue?
a. basal lamina b. skin c. neurons d. bone e. fibroblasts
Passive molecular diffusion occurs when ____
a. the energy of ATP is added b. random collisions between molecules occurs c. there are variations in molecular sizes d. enzymes catalyze their movement e. vesicles break off from the membrane
It is difficult to make an HIV vaccine because the ____
a. virus mutates rapidly b. cost is prohibitive c. virus uses DNA d. virus is a retrovirus e. components of the virus is found in high concentrations in the blood
In the human knee-jerk reflex of a seated individual, as the calf is raised from a vertical position to a horizontal position, the muscles of the quadriceps (on the front of the thighs) and the muscles of the hamstring (on the back side of the thighs
) are _____. A) both excited and contracting B) both inhibited and relaxed C) excited and inhibited, respectively D) inhibited and excited, respectively