The name of the enzyme used by Nirenberg and Matthaei to synthesize RNA primers to direct in vitroprotein synthesis using cell extracts is:
A. polynucleotide phosphorylase.
B. ribonucleotide synthetase.
C. ribonucleotide reductase.
D. deoxyribonuclease.
A
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The integration of phage DNA into the bacterial chromosome occurs because of
A. the phage's ability to synthesize an enzyme that integrates its DNA into the host's chromosome. B. the phage's ability to synthesize enzymes to enter the bacterium. C. similar RNA nucleotides in both. D. the similarity in enzyme metabolism. E. the phage's ability to synthesize enzymes to enter the bacterium AND similar RNA nucleotides in both.
Why are flu vaccinations recommended for individuals on a yearly basis?
a. Live viral vaccines revert to disease-causing forms after a year if not replaced. b. The body cannot create new flu antibodies, so they must be replaced yearly. c. Mutations alter viral markers, rendering previous vaccination ineffective. d. Yearly vaccinations allow scientists to track which vaccinations were effective.
Which of the following is not a function of a glycocalyx?
a. It forms pseudopods for faster mobility of an organism. b. It can protect a bacterial cell from drying out. c. It hides a bacterial cell from other cells. d. It allows a bacterium to stick to a host.
What is the general term for observable changes in cells that occur as a result of the viral infection?
A) cytopathic effects B) inclusion bodies C) syncytium D) transformation bodies