Which of the following is NOT true of LINEs and SINEs?
A. Both are non-LTR transposons.
B. Both require reverse transcriptase.
C. Both transcribe RNA in the nucleus.
D. Both are nonautonomous elements.
E. LINEs and SINEs both reintegrate by the same mechanism as all non-LTR transposons (target primed).
D
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The spread of cancer cells from their site of origin to sites distant in the body is called ________.
A. mitosis B. tumor C. metastasis D. growth
A cytotoxic T lymphocyte, having been activated against a particular viral antigen, "sees" this same antigen displayed on the surface of a host cell. What will happen?
A. The cytotoxic body cell will activate B cells which then produce antibody against the antigen. B. The cytotoxic T cell will produce proteins that cause the host body cell to die. C. The cytotoxic T cell will produce antibodies against the antigen. D. The antigen will move inside of the host body cell, thereby hiding from the cytotoxic T cell.
Which of the following do NOT contain endoplasmic reticulum?
A. noneukaryotes B. animal cells C. eukaryotic cells D. All of the choices are correct.
Antibodies are
A. specific molecules, or parts of molecules, that the body recognizes as foreign. B. enzymes secreted to destroy a pathogen's cell wall. C. proteins on the surface of our cells to which pathogens attach. D. cells that protect the body against invaders. E. proteins the body produces against invading substances.