Which is true about prokaryotic (bacterial) RNA polymerase?
A. It is used during transcription.
B. It does not require a primer.
C. It has a detachable subunit, sigma factor, which recognizes the promoter.
D. It reads the template in the 3'-5' direction.
E. All of the choices are true.
E
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Which one of the following is the joint evolution of two or more species resulting from a predator/prey relationship known as?
A. cohabitation B. coevolution C. niche overlap D. cooperativity
Hypothesis I: A flavin pigment absorbs blue light; this pigment then activates the proton pump.Hypothesis II: When CO2 concentration rises, a membrane receptor inactivates the proton pump.Stomata do not open when exposed to a narrow band of green light.
A. Supports both hypothesis I and II. B. Supports only hypothesis I. C. Supports only hypothesis II. D. Supports neither hypothesis.
The outermost layer of cells of the skin is the
A. stratum spinosum. B. stratum corneum. C. stratum basale (basal layer). D. stratum granulosum.
Gene flow, defined as the movement of genes from one population to another, can take place by migration as well as
A. mating between individuals of adjacent populations. B. mating with certain trait-containing individuals. C. mating with dominant phenotypes. D. removing the barriers between the populations. E. physical movement of genes within an individual by transposons.