Cells of the outer surface of a sponge obtain nutrients
by
a. absorbing food that diffuses from the central
cavity.
b. capturing food in their microvilli.
c. absorbing food distributed by amoeboid cells.
d. phagocytosing bacteria and other small food
items.
e. poisoning small fish that contact them
Answer: c
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O2 is transported from air in the lungs into the blood through the process of ____
a. active transport b. simple diffusion c. facilitated diffusion d. osmosis e. active transport
Dogs and pigs are members of different species because
A. one is a predator, and the other is prey. B. hybrids between them are infertile. C. they are at the far end of the ring in a ring species. D. of prezygotic barriers to their ability to breed. E. of postzygotic barriers to their ability to breed.
Bacteria and eukaryotes have similar sized ribosomes.
a. true b. false
A mutation that results in the premature halting of transcription (and, consequently, protein translation) of a particular gene is a ________ mutation
a. complementary b. missense c. nonsense d. transition