Given the structure of the anti-HIV drug azidothymidine (AZT), how do you think it blocks viral replication?
a. It blocks RNA synthesis
b. It inhibits host T cells from replicating
c. It inhibits the assembly of new viruses in the cell
d. It blocks DNA synthesis
e. It prevents HIV from entering the cell
Answer: d. It blocks DNA synthesis
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A proton pump is needed in the lysosomal membrane because:
A. the interior of the lysosome needs to be acidic. B. protons are being moved from low to high concentration. C. protons cannot move across a membrane on their own. D. All of the answer options are correct.
Pain is
a. one of the special senses. b. the perception of injury. c. dependent on interpretation by the brain. d. the perception of injury and dependent on interpretation by the brain. e. one of the special senses, the perception of injury, and dependent on interpretation by the brain.
Which one of the following statements is TRUE regarding fibrous joints?
A) They are freely movable and can bend and rotate. B) The bones are separated by a fluid-filled cavity that lubricates the joint. C) Fibrous joints present at birth between bones of the skull develop into sutures in the adult. D) The bones are held together by cartilage and tendons. E) They include hinge joints and ball-and-socket joints.
The STD ________ causes an inflammation of the liver and is preventable by ________.
A. gonorrhea; vaccination B. syphilis; male condom C. HIV; vaccination D. hepatitis A; vaccination E. hepatitis B; using a male condom