What is the name of the protein that helps to regulate multiple checkpoints throughout the cell cycle and is also known as the "guardian of the genome?"
A. Cdk
B. Ras
C. cyclin
D. p53
Ans: D. p53
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When compared to polypeptides synthesized in vitro on free ribosomes, the polypeptides synthesized from the same mRNA on microsome-bound ribosomes often are
a. the same size. b. larger. c. smaller. d. more hydrophobic.
Secretory IgA antibodies are unique because they
A) have unique light chains. B) are Y-shaped molecules. C) are present in the plasma. D) are connected with J chains and short polypeptides to form dimers. E) are present in lymph nodes.
A procedure using both reverse transcriptase and real time PCR can be used to
A. determine the number of copies of a DNA sequence in a sample. B. determine the number of copies of an RNA sequence in a sample. C. produce DNA fragments for cDNA cloning. D. both determine the number of copies of an RNA sequence in a sample and produce fragments for cDNA cloning. E. produce RNA fragments for cloning.
Which of the following definitions best describes an evolutionary arms race?
a. Prey adapts to selection pressure exerted by a predator. b. Prey responds to predation by evolving defensive weapons (e.g., antlers or sharp hooves). c. Prey responds to selection pressure from a predator who in turn responds to the selection pressure exerted by the prey's counter-adaptation. d. Prey responds to selection pressure from a predator by improving its defensive weapons (e.g., antlers or sharp hooves) who in turn responds to the selection pressure exerted by the prey's defensive weapons by better offensive weapons (e.g., longer teeth).