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. positive feedback.
B. negative feedback.
C. equilibrium.
D. denaturation.
E. a coenzyme.
B. negative feedback.
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Which of the following is a critical region of a tRNA molecule? (choose all that apply)
A. amino acid attachment site B. anticodon loop C. stop codon D. aminoacyl site E. ribosome binding site
The transfer of antibodies in breast milk is a good example of
A. artificially acquired active immunity. B. artificially acquired passive immunity. C. naturally acquired active immunity. D. naturally acquired passive immunity.
Oxidative phosphorylation is the process by which ____
a. high energy NADH is made to supply the cell with its needed energy b. a final electron acceptor is used indirectly to facilitate the production of ATP c. ATP is made using high energy intermediates of cellular respiration d. specific enzymes are regulated to control cellular respiration e. NAD+ is regenerated to allow glycolysis to continue
Which of the following is false concerning stem
cells? a. They are undifferentiated cells. b. They arise from a fertilized egg. c. They can be coaxed to differentiate. d. They are obtained from a portion of a plant body. e. They may help mend damaged tissue.