Most intracellular receptors are what type of protein?
a. DNA
b. steroids
c. enzymes
d. neurotransmitters
e. transcription factors
ANSWER: e
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Why is it that there is less variation among individuals in any one non-African population than among individuals in the contemporary African population?
A. Because the individuals that left Africa were a relatively small sample of the total amount of variation present. B. Because the individuals that left Africa exhibited a greater number of mutations than the African population. C. Because the African population was larger than the populations that left, they had more mutation. D. There is no reason because the above statement is incorrect.
Select all correct descriptions of the limbic system.
A. contains the amygdala and hippocampus B. integrates our emotions with our higher mental functions C. contains a number of reflex centers D. accounts for why eating and sexual behavior seem pleasurable
Conifers do not have flowers to attract pollinators. Instead, fertilization occurs
A) as the sperm and egg unite inside the woody cone. B) when the endosperm takes the place of the male gametes. C) via wind pollination. D) when birds transfer pollen in their droppings after eating the pine seeds. E) when insects coated with pollen are trapped in the sticky resin.
Which one of the following enzymes generates a covalent bond and joins Okazaki fragments in the DNA backbone?
a. primase b. helicase c. ligase d. DNA polymerase e. RNA polymerase