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
c
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Analysis of DNA sequences from two individuals of the same species results in a greater estimate of genetic variability than does analysis of amino acid sequences from the same individuals because...
A. different DNA sequences can code for the same amino acid B. Some amino acid variations cannot be detected b protein electrophoresis C. DNA sequencing is more reliable technique than protein electrophoresis D. proteins are more easily damaged than is DNA E. DNA is more heat-sensitive and therefore varies more
Which of the following statements regarding the development of AIDS following infection with HIV is incorrect?
A. Antibodies to HIV antigens formed in response to HIV infection appear within a few weeks of infection and remain high through latency and AIDS. B. CD4 T cells are present in low numbers in an uninfected individual, but become elevated upon HIV infection, and ultimately fall to very low numbers (<200 cells/ml) as the infection progresses to AIDS. C. An HIV-positive individual in the latency phase can be distinguished from an uninfected individual by the presence of antibodies to HIV antigens in their blood. D. Viral antigens can be detected at high levels in the blood within days following infection, then their numbers fall dramatically during a latent period and rise again when AIDS symptoms occur.
Which of the following characterize B cells?
A. They are manufactured and mature in the bone marrow. B. They function in antibody mediated immunity against bacteria. C. They directly recognize antigens and undergo clonal selection. D. All of the choices characterize B cells. E. None of the choices characterize B cells.
Why does food taste bland when you have a cold?
What will be an ideal response?