If two organisms are in the same phylum, they must also be in the same:
a. class
b. species
c. family
d. kingdom
Ans: d. kingdom
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A chi-square test is used to
(a) determine if experimental data adequately matches what was expected. (b) analyze a Punnett square. (c) determine parental genotypes producing a given offspring genotype. (d) determine if a trait is dominant or recessive.
What is the difference between mismatch repair and nucleotide excision repair?
A. In mismatch repair, several nucleotides are replaced, whereas in nucleotide excision repair it is just one. B. In mismatch repair, one nucleotide is replaced, whereas in nucleotide excision repair several nucleotides are replaced. C. In mismatch repair, several nucleotides are replaced, whereas in nucleotide excision repair the sugar phosphate backbone is fixed. D. In mismatch repair, the sugar phosphate backbone is fixed, whereas in nucleotide excision repair, several nucleotides are replaced.
In which of the following situations would speciation be most likely to occur?
A) A population of juniper shrubs is split in two by a canyon. Every year, strong winds carry a small amount of the shrubs' pollen across the canyon. B) A Japanese mollusk species whose larvae are often carried from port to port in ship bilge (waste) water now flourishes in San Francisco Bay, a busy commercial port. C) Bighorn sheep occupy mountains from Canada to Death Valley in Southern California, interbreeding all the way. The populations at the two ends of the range live in very different environments. D) Seven monkeys escape from an enclosure. To everyone's surprise, they establish a small but viable population, coexisting successfully with humans in a partly suburban environment very different from their native African habitat.
Monocytes circulate in the blood and lymph until they find an infected tissue, then they become what type of cell?
a. B cell b. T cell c. macrophage d. mast cell