Cytotoxic T-cells attack:
a) Host cells infected with bacteria
b) Transplanted tissue cells from another host
c) Cancer cells
d) Two of the above are true
e) All of the above are true
Answer: e) All of the above are true
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Aging can sometimes lead to an increase in the stiffness at the base of the basilar membrane. What affect would this have on a person's hearing?
A. They would only be able to hear loud sounds. B. They would lose the ability to hear highpitched sounds. C. They would lose the ability to hear lowpitched sounds. D. They would not be able to distinguish the amplitude of a sound.
How does the protein Sic1 regulate the cell cycle?
a. Sic1 is a cyclin that binds to a Cdk to form a cyclin/Cdk complex, which regulates the G1 to S transition. b. Sic1 inhibits an S phase cyclin/CDK complex required for synthesis to occur c. Sic1 binds to a cyclin, to form a complex that regulates the G2 to M transition. d. Sic1 is a growth factor that binds to external receptors and promotes the transition from G1 to S. e. Sic1 is a cyclin that binds to a Cdk to form a cyclin/Cdk complex to regulate the G2 to M transition.
Which proteins would you target if you wanted to disrupt the chromosome superstructure for chromatin condensation that ultimately produces the characteristic shape of the metaphase chromosome?
What will be an ideal response?
What is meant by the clonal expansion of a B cell?
a. An activated B cell will engulf and digest anything foreign. b. An activated B cell divides into cells that give rise to memory B cells and plasma cells. c. An activated B cell will immediately begin to produce antibodies. d. An activated B cell will kill infected host cells.