One component of the cell membrane functions as a selective barrier, and one component has specific functions such as transport, recognizing other cells, and binding to other cells. Which pair of terms refers to these two components, respectively?
a. carbohydrate and nucleic acid
b. lipid and carbohydrate
c. protein and carbohydrate
d. lipid and protein
Answer: d. lipid and protein
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The birds that are most highly adapted to marine life are the:
a. tubenoses. b. gulls. c. penguins. d. pelicans. e. sandpipers.
In what other areas of biological study is systematics important?
a. ecology b. physiology c. anatomy d. genetics e. all of the these
In the fetus and during early puberty, in addition to corticosteroids, the adrenal cortex produces
a. insulin. b. androgens. c. ACTH d. epinephrine. e. norepinephrine.
The UV light affects the nucleotide bases of DNA. What can UV light form, and how many neighbouring bases of DNA become covalently linked in this situation?
a. It can form a primer with two bases linked. b. It can form a dimer with one base linked. c. It can form a trimer with three bases linked. d. It can form a dimer with two bases linked.