A woman heterozygous for color blindness (an X-linked recessive allele) marries a man with normal color vision
What is the probability that their first child (male or female) will be color blind?
a. 25%
b. 50%
c. 75%
d. 100%
e. 0%
ANSWER: a
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A researcher is studying the function of a peptide hormone in rabbits and humans. She notices that this hormone has a different effect in these two mammals, despite the hormone receptor having the same sequence (and structure) in both animals
What accounts for this difference in hormone function? What will be an ideal response?
A drug that inhibits the activity of bacterial DNA gyrase ______ be a good antibiotic because _______
A. would; it would inhibit all DNA synthesis B. would NOT; it would inhibit all DNA synthesis, even our own cell's DNA synthesis C. would; it would selectively inhibit bacterial DNA synthesis due to differences between bacterial/human gyrase D. would NOT; the DNA replication machinery could still function, even with impaired DNA gyrase enzyme
Symptoms of phenylketonuria (PKU) may be minimized or suppressed by a diet low in
a. serine. b. glycine. c. phenylalanine. d. proline. e. glutamic acid.
A mushroom is the fleshy, spore bearing reproductive structure of some fungi.
a. true b. false