Features that are similar in organisms that are not evolutionarily related are due to
A. chance alone.
B. similar selective pressures.
C. differing selective pressures.
D. directional mutation.
Answer: B
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One important difference between amniocentesis and chorionic villus sampling is that ____
a. chorionic villus sampling is more routine b. amniocentesis can diagnose chromosome disorders, while chorionic villus sampling cannot c. chorionic villus sampling can be done earlier in the pregnancy than amniocentesis d. maternal risks are higher with chorionic villus sampling e. the risk of miscarriage is higher with amniocentesis than with chorionic villus sampling
An organism that is eukaryotic is by definition:a
is a protist b. is unicellular c. possesses a nucleus d. possesses organ systems e. belongs to domain Bacteria
The cell cycle is monitored as each cell passes through checkpoints
a. true b. false
Opportunistic infections typical of AIDS but rare otherwise include
A) tuberculosis. B) Pneumocystis pneumonia. C) Kaposi's sarcoma. D) tuberculosis and shingles. E) Pneumocystis pneumonia and Kaposi's sarcoma.