Which of the following groups contains prokaryotic organisms capable of surviving the greatest extremes in temperature or salt concentration?
A. Protista
B. Archaebacteria
C. Plantae
D. Fungi
E. viruses
Ans: B. Archaebacteria
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A system with two separate circuits is indicated by
a. A. b. B. c. C. d. all of these. e. none of these.
A dominant allele is found in a population with a frequency of 0.8. As the environment begins to change, the dominant allele is not favored. Scientists find that the frequency of the dominant allele decreases by half each generation. What are the allele, genotype, and phenotype frequencies before and one generation after the population begins to change? Is Hardy-Weinberg equilibrium maintained?
What will be an ideal response?
Disadvantages of continuous cell cultures include
A) they only grow for a limited number of generations. B) the expense of preparation. C) they may be significantly different genetically from the original source animal. D) viruses do not reliably infect them. E) they are both expense and have a limited number of division.
In order for transcription to be initiated
A. DNA polymerase must have access to the DNA double helix and must also be capable of binding to the gene's promoter. B. RNA polymerase must have access to the DNA double helix and must also be capable of binding to the gene's promoter. C. DNA polymerase must have access to the RNA and must also be capable of binding to the gene's promoter. D. RNA ligase must have access to the DNA double helix and must also be capable of binding to the gene's promoter. E. RNA polymerase must have access to the DNA double helix and also must be capable of binding to the gene's operator.