Amniocentesis is a procedure that is normally used
A. to change the sex of the fetus.
B. to reduce the risk of genetic disease.
C. for nourishing the fetus.
D. for gene therapy.
E. for diagnosis of genetic disorders.
Answer: E
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The negative subatomic particle is
a. the neutron. b. the proton. c. the electron. d. both the electron and the proton. e. both the proton and the electron
When a mixture of live nonvirulent bacteria and dead virulent bacteria was injected into mice, Griffith unexpectedly found that the injected mice died. He explained this result by suggesting that the nonvirulent bacteria are being
A. transcribed. B. activated. C. transformed. D. expressed. E. translated.
Water is a polar molecule because:
A) hydrogen has more neutrons than oxygen. B) oxygen has more neutrons than hydrogen. C) hydrogen is more electronegative than oxygen. D) oxygen has more electrons than hydrogen. E) oxygen is more electronegative than hydrogen.
One possible reason for the lack of a nucleus in sieve-tube cells may be that the nucleus would:
A. impede bulk flow B. cause the cell to die C. pass through the plasmodesmata and disrupt bulk flow D. cause the cell plate not to form E. interfere with bulk flow in the xylem