The Human Immunodeficiency Virus (HIV) only affects a specific class of cells in the immune system called T helper cells, and not other types of T cells. Which is the best explanation for this observation?
a. HIV can only replicate inside of T helper cells
b. Only T helper cells have reverse transcriptase
c. The T helper cells are not necessary for the immune system to fight viral infections
d. Only T helper cells have the correct receptor on their cell surface
e. HIV can only be released from T helper cells
d. Only T helper cells have the correct receptor on their cell surface
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An example of an irreversible inhibitor is
A) a competitive inhibitor. B) acetylcholinesterase. C) a noncompetitive inhibitor. D) penicillin. E) isoleucine.
During replication, the direction of synthesis of new DNA from the leading and lagging strands is
A) 5' to 3' only. B) 3' to 5' only. C) from left to right only. D) both 5' to 3' and 3' to 5'. E) different, depending on whether the cell is prokaryotic or eukaryotic.
The HBV genome is a circular dsDNA molecule that consists of ________.
A. one complete but nicked strand B. one complete but nicked strand and a complementary strand C. a complementary strand D. segmented DNA
Heat is used in DNA sequencing to ________ the double strands of the molecule.
Fill in the blank(s) with the appropriate word(s).