Which of the following is properly matched?
a. osteoblasts; bone breakdown
b. osteocytes; initial bone formation
c. osteoclasts; initial bone formation
d. osteoclasts; bone breakdown
e. osteoblasts; imprisoned in bony matrix
Answer: d
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Examine Figure 48.5 in your text. According to this figure, mean temperature changes from 1940–1980 and 1999–2008 have been greatest:
A. in Australia. B. in southern Africa. C. near the equator. D. in South America. E. in the northern hemisphere.
During attachment of phage to E. coli, the phage
A. actively seek out the bacteria. B. randomly bump into the bacteria. C. attach to proteins or carbohydrates on the bacterial surface. D. attach to the bacterial RNA. E. randomly bump into the bacteria AND attach to proteins or carbohydrates on the bacterial surface.
In vertebrates, mechanoreceptors are not found in which of the following:
1.skin 2.skeletal muscles 3.walls of blood vessels 4.internal organs 5.all of these structures have mechanoreceptors
The finding that homeotic genes are present in both mammals and insects indicates that these genes must
A. have arisen very early in the evolutionary history of animals. B. control the same traits. C. have developed independently and simultaneously. D. have been transmitted into mammals by an insect bite. E. be on the same chromosomes.