How does cleavage of the repressor result in induction of the lytic cycle?
What will be an ideal response?
Ans: Cleavage of the repressor in the connector region eliminates its ability to dimerize. Dimers have a great affinity for the operator than monomers. As monomers, the repressor subunits dissociate more readily from the operator, and RNA polymerase can bind to the promoter.
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Some members of the Archaea domain are often referred to as extremophiles because many live in conditions of extreme
A. temperature. B. salinity. C. heat. D. acidity. E. All of the answer choices are correct.
Proteins are three dimensional molecules made of strands of amino acids (imagine a ball of string). There are 20 different amino acids used in proteins found in living organisms. Some of these amino acids are polar and others are nonpolar. Where would a series of nonpolar amino acids most likely be located in a protein that is found in the cytosol of an animal cell?
A. In the interior of the protein B. At the very top of the protein C. On the surface of the protein D. At the very bottom of the protein
In which of the following stages of the cell cycle would you find chromosomes separated into individual chromatids?
A. prophase B. metaphase C. telophase D. cytokinesis
A high school student in Nepal is accepted—and eventually attends—college in the United States. His diet goes from one that is rich in vegetables and grains to one that primarily consists of meat and sugars
What will happen to the bacterial composition of his intestines? A. There will be more Firmicutes inhabiting his intestinal tract. B. There will be more Bacteroidetes inhabiting his intestinal tract. C. Nothing will happen; there is no relationship between bacteria in the intestines and diet. D. Bacteria will no longer inhabit his intestines.