In which of these environments would you normally find prokaryotes?
A) An animal's intestinal tract
B) Human skin
C) A single drop of seawater
D) A spoonful of soil
E) All of the above
E
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Judy had plaque buildup in her arteries. When one of these ruptured, a blood clot traveled to
her brain where it blocked blood flow, resulting in death of some of the brain cells. This is an example of __________.
a. a stroke b. atherosclerosis c. coronary heart disease d. a carcinogen
Which of the following statements is(are) true of
homeotic genes? a. More than one hundred of them have been identified. b. The same mechanisms control their transcription regardless of the species. c. Many of them are functionally interchangeable among species. d. They likely evolved in the most ancient eukaryotic cells. e. All of these are true.
Which of the following organisms would you expect
to find preserved as a fossil? a. a jellyfish b. a shelled arthropod such as a trilobite c. an earthworm d. a nematode e. a protistan such as an amoeba
In conjugation, F+ cells
A) serve as recipient cells. B) contain an F plasmid. C) do not have conjugation pili. D) can transfer DNA only to other F+ cells. E) contain "jumping genes."