Skin color and eye color are an example of ____
a. pleiotropy
b. polygenic traits
c. codominance
d. continuous variation
e. multifactorial traits
ANSWER: b
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You are investigating an abnormal eukaryotic cell line that makes all of its mRNAs much longer than the mRNAs from normal cells (that is, they have more nucleotides than usual). Intrigued, you examine the proteins in these abnormal cells and note that
many of them are either much longer or much shorter than the normal proteins from nonmutant cells. Assuming there is just one mutant defect in these cells, what is that defect? A. A stop codon is mutated. B. RNA polymerase does not recognize the terminator sequence. C. Release factor is defective. D. The spliceosome is nonfunctional. E. The enzyme that adds the poly-A tail is defective.
Histology is the study of
a. cells. b. organelles. c. tissues. d. organisms.
Molecules with the same empirical formula but different structural formulas are
A. polymers. B. steroids. C. isomers. D. enzymes.
CREB is activated by
a. cAMP binding in the nucleus. b. phosphorylation by protein kinase A in the nucleus. c. cAMP binding in the cytoplasm. d. phosphorylation by protein kinase A in the cytoplasm.