The building blocks of nucleic acids are
a. amino acids.
b. nucleotides.
c. pentose sugars.
d. phosphate groups.
e. nitrogenous bases.
B
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The rigid barrier that surrounds most prokaryotes is the
A. cell wall. B. cytoplasm. C. glycocalyx. D. cell membrane. E. flagellum.
Which type of white blood cells produces defensive proteins called antibodies?
A. Natural killer cells B. B cells C. Phagocytic cells D. T cells
According to MacArthur and Wilson's island biogeography theory, which of the following would be expected to have the smallest species richness?
A. the mainland B. a large island near the mainland C. a large island far from the mainland D. a small island near the mainland E. a small island far from the mainland
Which is not a group of helminths?
a. trematodes b. nematodes c. cestodes d. anthropods