What is it that makes HIV so "good" at evolving?
Answer: It is not so good at copying itself
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A newly developed drug works by blocking thyroid hormone receptors throughout the body. Which of the following would be expected to occur in a patient taking this drug?
A. changes in metabolism B. decreased resorption of bone C. increased uptake of glucose by body cells D. inability to release cortisol E. production of more dilute urine
An enzyme synthesized in the laboratory is found to have little activity when compared to the enzyme extracted from cell culture. Both enzymes were examined and have identical amino acid composition. What is the best explanation for the lack of activity of the synthesized enzyme?
A) The van der Waals radius was altered during laboratory synthesis. B) The synthetic enzyme was not made of amino acids. C) The ATP required for self-assembly was present in the cell extract but not in the laboratory synthesis. D) Denaturation of the synthesized enzyme was not complete. E) The synthesized enzyme was not folded correctly because molecular chaperones were not present.
Which of the following belongs to the Trematoda class of flatworms?
a. internal parasites of mollusks b. nematodes c. internal parasites of vertebrates d. tapeworms
Ecdysone is a hormone that causes molting of the exoskeleton in insects. Why do ecdysone-based pesticides have no effect on humans?
What will be an ideal response?