The person who first used the term cell was
a. Darwin.
b. Leeuwenhoek.
c. Hooke.
d. Watson.
c
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Amphibians are thought to have evolved from
A. ray-finned fish. B. lobe-finned fish. C. spiny fish. D. skates and rays. E. annelids.
A scientist fused a mouse cell and a human cell, then treated the cell with specific antibodies covalently linked to
colored fluorescent dyes (antibodies to mouse proteins were labeled green; antibodies to human proteins were labeled red). Forty minutes later, what will the researcher observe?
a. The fused cell will still be half red and half green. b. The red and green fluorescent labels will be uniformly distributed throughout the entire membrane. c. The red and green labels will be distributed in intermingled patches. d. The red and green labels will flash intermittently. e. The red and green labels will be distributed in a swirling pattern.
Ribosomal subunits
a. come together in threes to form functional units. b. are composed of mRNA and structural proteins. c. are synthesized in the cytoplasm. d. converge only when mRNA is to be translated. e. are transcribed from the complementary strand of DNA that is used for tRNA transcription.
Responses to heat stress include
a. reduction in muscle contraction. b. increased sweating. c. dilation of peripheral blood vessels. d. loss of salts and liquids. e. all of these.