Your liver produces 90% of the cholesterol found in your body. When cholesterol levels get too high, the first enzyme in the pathway of cholesterol synthesis is inhibited. This is an example of
A. Feedback inhibition
B. Equilibrium
C. Denaturation
D. A coenzyme
E. Positive feedback
Answer: A
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Events that occur during transcriptional regulation in eukaryotes include
A. DNA replication. B. mRNA translation. C. RNA processing and export from the nucleus. D. polypeptide synthesis. E. chromatin conversion to a closed conformation.
The letter “F” from the above figure represents
a. complement. b. MHC markers with antigen expressed to the surface of a cell. c. lysosome fusing with a phagosome. d. plasma membranes fusing. e. MHC recycling.
What process do most fish use as a means of reproduction?
A) copulation B) external fertilization C) internal fertilization D) binary fission
In Earth's history, what might the cooling of the Earth and the resulting change from a forested to a grassy landscape have made adaptive in humans?
A. social structure B. grasping fingers C. complex language D. bipedalism