When bound to the DNA, the repressor protein usually prevents attachment of the RNA polymerase to the ________.
A. promoter
B. operon
C. operator
D. regulator
Answer: A
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Cholesterol is a structural component of cell membranes. Amount of cholesterol present can affect membrane stability and permeability. What is the role of cholesterol in a membrane?
A. A membrane that needs to be more rigid and more permeable, would have high cholesterol ratios. B. A membrane that needs to be rigid, such as a protective barrier, would have low cholesterol ratios. C. Membranes with low amounts of cholesterol are very stable and have increased permeability. D. Membranes with high amounts of cholesterol are very stable and have decreased permeability.
Acquired immune deficiency syndrome (AIDS) now infects about
a. 20 million people; however, the number is decreasing because of an effective vaccination campaign. b. 20 million people; however, the number is decreasing because of effective antibiotic treatments. c. 33 million people; however, the number is decreasing because of an effective vaccination campaign. d. 33 million people; however, the number is decreasing because of effective antibiotic treatments. e. 33 million people, and continues to spread.
What is the environmental advantage of using strip logging?
1.Runoff from the cleared area rolls down to the previously logged region below.
2.Small strips of logged areas can provide wildlife corridors.
3.The road is cut along a streambed to avoid disrupting the forest ecosystem.
4.Strip logging involves planting strips of different species to try to increase biodiversity.
How will DNA replication be affected if DNA polymerase I has a mutation that inactivates 5'-to-3' exonuclease activity?
What will be an ideal response?