Drugs like AZT, ddC, or ddI work against the AIDS virus because they
A) destroy viral proteins.
B) look like hairpins to cause premature termination of viral mRNA.
C) look like tRNAs and block viral translation.
D) look like nitrogenous bases and block viral reverse transcriptase.
E) prevent the virus from releasing its genome into the cytoplasm.
D) look like nitrogenous bases and block viral reverse transcriptase.
Drugs like AZT, ddC, or ddI work against the AIDS virus because they look like nitrogenous bases and block viral reverse transcriptase.
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A complication of molecular clock studies is that
A) DNA and proteins appeared in life at about the same time. B) genes mutate at different rates. C) DNA is not often preserved in fossils. D) some species are more highly evolved than others.
The upstream region of an mRNA, acting as a riboswitch, binds a(n) ________ and results in translational blockage of the downstream protein-encoding sequence
a. antisense RNA b. metabolite c. peptide d. RNAi
The clear fluid found in whole blood in which the cells are suspended is called ______; however, when the clotting factors are removed, it is now called ______.
A. serum; plasma B. plasma; serum C. whole blood; serum D. plasma; whole blood
All the following pertain to Staphylococcus epidermidis infections, except:
A. they often from an endogenous source. B. they typically occur after insertion of shunts and prosthetic devices. C. catheterization can introduce the organism and lead to urinary tract infection. D. the organism is coagulase negative. E. the organism produces a large number of tissue damaging enzymes and toxins.