A human male has engaged in sexual activity. Did he use his sympathetic or parasympathetic nervous
system? What will be an ideal response?Actually, both systems were used. For the male to achieve an erection, the parasympathetic system
would have generated a response. However, to ejaculate, the sympathetic system would have needed
to be in charge.
Actually, both systems were used. For the male to achieve an erection, the parasympathetic system
would have generated a response. However, to ejaculate, the sympathetic system would have needed
to be in charge.
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Which of the following is not true of telomerase function?
A. Telomerase carries a 9-base DNA template complementary to 1.5 repeat units of the telomere sequence. B. One strand of the telomere sequence is elongated 6 bp at a time. C. The telomerase repeats its reaction many times in one telomere-binding event. D. The telomeres extended 3' end is made double-stranded by lagging strand synthesis. E. The RNA template is repositioned after each extension of the 3' end.
Choose the letter of the best match: Prevention of embryo implantation
A. birth control pill B. intrauterine device C. diaphragm D. foams and jellies E. vasectomy
The following experiment is hypothetical. Meselson and Stahl labeled DNA with the heavy N15 isotope of nitrogen, then allowed the DNA to go through one round of replication in the presence of the light N14 isotope. After analyzing the resulting double stranded DNA helices in a CsCl density gradient they observed two bands of DNA in the gradient. One band was found in a position expected for DNA that had only the light N14 isotope, while the other band was found at the heavy N15 position. These observations are consistent with which mode of DNA replication?
a. dispersive replication b. conservative replication c. dispersive or semi-conservative replication d. semi-conservative replication
When were the first cases of SARS reported?
A. 2002 B. 2012 C. 1992 D. 1820 E. 1920