The biological macromolecule that is least soluble in water is a(n):
A. nucleic acid.
B. protein.
C. carbohydrate.
D. lipid.
E. enzyme
Answer: D
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Genetic changes, under control of the Paax6 gene, led to
A. the evolution of one type of eye.
B. one photoreceptor in each modern eye.
C. the evolution of many types of eyes using ommatidia and simple eye structures.
D. a cluster of photoreceptor cells in every eye.
E. none of these are correct
What limits the frequency of action potentials?
A. chloride ions B. spike amplitude C. nodes of Ranvier D. refractory period
The anterior pituitary responds to hormones produced by which organ?
a. pancreas b. adrenal glands c. hypothalamus d. thalamus
An increase in the rate of respiration indicates an
a. increase in ATP production. b. increase in ATP utilization. c. increase in O2 production uptake. d. all of the above.