Mutational hot spots occur most often where the DNA is
A) unwound and stretched.
B) repetitive or symmetrical.
C) highly coiled.
D) bound by RNA polymerase.
B) repetitive or symmetrical.
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An herbivore
(a) eats plant material. (b) eats producers. (c) is exemplified by a deer. (d) is all of the above.
The variation of the color in Siamese cats is due to
a. incomplete codominance. b. inactive X chromosomes. c. environmental effects on phenotypes. d. quantitative inheritance. e. multiple alleles.
Gap genes of Drosophila embryos:a
organize the embryo into broad regions and influence the activity of pair-rule genes. b. are missing from the chromosomes of mutant flies. c. are genes that have moved to gaps on other chromosome during meiosis. d. cause gaps in the cell cycle. e. cause the death of embryos before they hatch.
During ventricular systole, the semilunar valves ________ and the AV valves ________
A) open; open B) close; open C) open; close D) close; close