If the frequency of the recessive allele is 30 percent,
the frequency of the heterozygous carrier is what
percent?
a. 42
b. 9
c. 27
d. 60
e. 80
Answer: a
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The first vertebrates appear in the fossil record during the
A. Cambrian Period. B. Proterozoic Era. C. Carboniferous Period. D. Triassic Period. E. Devonian Period.
In contrast to the cephalic and absorptive phases, the fasting phase is characterized by high blood levels of _________ and ________________.
Fill in the blank(s) with the appropriate word(s).
DNA is constructed of
A) a single strand of nucleotides with internal hydrogen bonding. B) two complementary strands of nucleotides bonded A—C and G—T. C) two strands of nucleotides running in an antiparallel configuration. D) two strands of identical nucleotides in a parallel configuration with hydrogen bonds between them. E) None of the answers is correct.
The primary function of molecular membranes is the transport of ions and molecules in and out of cells. The movement of molecules from areas of low concentration to those of high concentration against chemical gradients is best described as:
A) passive transport. B) osmosis. C) active transport. D) channel-mediated diffusion. E) electron transport.