Reverse transcriptase, the enzyme responsible for copying viral RNA into cDNA prior to integration into the host genome, lacks 3'-to-5' exonuclease "proofreading" ability. How is this advantageous to organisms that depend on such enzymes?
What will be an ideal response?
Retroviruses depend on reverse transcriptase. Part of the successful infection and proliferation strategy of retroviruses like HIV is their high mutability. The errors made by the enzyme are useful in generating variable progeny viruses that can evade the host's immune system.
You might also like to view...
The second messenger inositol triphosphate (IP3) appears to be involved in stomatal closure triggered
by
a. auxins. b. abscisic acid. c. oligosaccharins. d. salicylic acid. e. gibberellins.
In the deductive approach to scientific thought processes, we begin with __________ and make
__________ based on that information. a. premises; observations b. observations; premises c. observations; conclusions d. observations; inductions e. premises; conclusions
Select the best response to the question. ?What is a risk factor for contracting tapeworm or hookworm?
A) poor sanitation B)living or traveling in the Middle East C) living in a nursing home D) young age
What are epithelial cells with a flat, irregular shape and tapered edges called?
A. cuboidal B. pseudostratified C. stratified D. squamous E. columnar