Consider the links in the chain of infection. Which of the links is broken when hands are thoroughly washed?
A. Virulence
B. Exposure
C. Dose
D. The agent
E. Susceptibility
Answer: B
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Which of the following accurately describes the process used to make Dolly the sheep?
A. Mitochondrial DNA was taken from one female and injected into the mammary of another female. B. A sheep embryo was produced by in vitro fertilization. At an early stage, the cells of the embryo were separated, and each cells was put into a surrogate sheep mother. C. A mammary cell of one sheep was fused with an enucleated egg of another sheep. The resulting diploid embryo was placed in a surrogate sheep mother. D. A set of twins — one male and one female — were mated. Since the twins had identical DNA, their lamb was a clone. E. The sheep to be cloned was given a drug that induced the cells of her ovary to divide by binary fission. The resulting diploid eggs did not need to be fertilized.
A duplicated chromosome has _____ chromatid(s)
a. one b. two c. three d. four e. zero
What experimental results would indicate that the mutation lacIs is dominant to lacI+?
What will be an ideal response?
In addition to showing that DNA carries genetic information, the experiments of Avery, McCleod, and McCarty demonstrated that:
A: DNA is present in bacteriophage. B: DNA may be taken up by bacterial cells and be active. C: DNA is a double helix. D: DNA binds to the cell wall of the bacterium. E: eukaryotic cells may be genetically transformed.