The mosaic effect of X inactivation in calico cat fur can be observed in
a. skin color only.
b. hair color only.
c. fingernails only.
d. the location of sweat glands.
e. all its tissues.
ANSWER: b
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Alcoholic fermentation requires __________ and is an __________ type of reaction
a. oxygen; aerobic b. oxygen; anaerobic c. sugar; aerobic d. sugar; anaerobic
In order for a cell to respond to the signaling molecule epinephrine, it must ____
a. have ion channels b. have a lipid bilayer that allows the response to occur c. have receptors exposed on the inner plasma membrane surface d. have receptors exposed on the plasma membrane surface e. have nuclear membrane receptors
What was the niche filled by the first fish? a. Hunting in intertidal communities
b. Scavenging the ocean bottom. c. All of these choices. d. Feeding on photosynthetic surface organisms.
In mRNA codons: UUU = phenylalanine, GUU = valine, UAU = tyrosine, UGU = cystine, GGU = glycine. If the third amino acid in a protein were valine, the codon sequence for that amino acid would be
A. UAU. B. GGU. C. UUU. D. GUU.