In males, sterilization involves a vasectomy, which removes a portion of what structure?
A. vas deferens
B. epididymis
C. seminiferous tubules
D. Sertoli cells
A. vas deferens
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Which of the following explains the difference between VNTRs and RFLPs?
A. In VNTRs, we are looking at sequence differences in genes; in RFLPs we are looking at sequence differences in noncoding DNA. B. In VNTRs, we are looking at sequence differences in noncoding DNA; in RFLPs we are looking at sequence differences in genes. C. In VNTRs, we are looking at the number of times a sequence is repeated; in RFLPs we are looking at size differences resulting from different restriction sites being present. D. In VNTRs, we are looking at size differences resulting from different restriction sites being present; in RFLPs, we are looking at the number of times a sequence is repeated.
Meiosis results in the generation of
a. four haploid cells. b. two diploid cells. c. two diploid cells and two haploid cells. d. four diploid cells. e. one haploid and three diploid cells.
Homeostasis means that
A. cells have enough water. B. all organisms require an energy source. C. environmental conditions are held constant and do not change. D. a population changes over time. E. conditions inside a cell or organism remain within a constant range.
The usefulness of antibiotics is hampered by __________.
a. the emergence of antibiotic-resistant bacteria b. their inability to kill gram negative bacteria c. difficulties encountered in mass production d. the limited types of antibiotic available e. an antibiotic's lack of specificity for bacterial versus animal cells