What is the best way to minimize our energy
impact?
a. use solar power
b. use hydroelectric power
c. use coal based power
d. use wind generated power
e. use less energy
E
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Meselson and Weigle grew one strain of bacteriophage lambda with alleles A and B in heavy isotopes and another strain with alleles a and b in light isotopes. Both loci are located near the end of the viral chromosome. Which statement best describes their results and conclusions?
A) They visualized the broken chromosomes under a microscope and concluded that DNA was exchanged between light and heavy chromosomes during recombination. B) They found a gradient of all densities of recombinant chromosomes and concluded that DNA was not exchanged between light and heavy chromosomes during recombination. C) They found that some A b genetic recombinants were almost as dense as the A B parent chromosome and concluded that DNA was exchanged between light and heavy chromosomes during recombination. D) They found that some A b genetic recombinants were almost as dense as the A B parent chromosome and concluded that DNA was not exchanged between light and heavy chromosomes during recombination.
A virus is composed of each of the following except:
A) capsid B) proteins C) DNA or RNA D) ribosomes
Experiments have been done to determine the infective dose of a specific pathogen in animals with normal microbiota and gnotobiotic animals. Predict how the infective dose for gnotobiotic animals is expected to compare to the infective dose of animals with normal microbiota.
A. The infective does would be higher for the gnotobiotic animals. B. The infective dose would be the same for both groups of animals. C. The infective dose would be lower for the gnotobiotic animals.
Ornithosis
A. is a zoonosis of certain types of birds. B. is a mild, upper respiratory tract illness. C. is caused by Chlamydophila pneumoniae. D. has humans as a reservoir. E. All of the choices are correct.