Infectious protein particles are called ________.
A. viroids
B. spikes
C. oncogenic viruses
D. phages
E. prions
Answer: E
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You have discovered an enzyme that can catalyze two different chemical reactions. Which of the following is most likely to be correct?
A) The enzyme contains ?-helices and ?-pleated sheets. B) The enzyme is subject to competitive inhibition and allosteric regulation. C) Two types of allosteric regulation occur: The binding of one molecule activates the enzyme, while the binding of a different molecule inhibits it. D) Either the enzyme has two distinct active sites or the reactants involved in the two reactions are very similar in size and shape.
Explain the phenomenon known as diauxic growth. Hypothesize why this type of regulation might be important for survival of a microbe in a community as well as a situation where lacking it might be advantageous
What will be an ideal response?
To test whether the XFF signal system is similar to that of epinephrine, you microinject a nonhydrolyzable analogue of GTP into an XFF-responsive cell. If the XFF mechanism is similar to that of epinephrine, you would expect the cellular response to be
A) blocked completely. B) prolonged. C) delayed. D) 50 percent of normal. E) It is not possible to predict without knowing how many receptors are present on the cell.
What is adiabatic cooling?
A. the cooling due to increased cloud cover at higher elevations B. the cooling due to polar air masses flowing toward the equator C. cooling due to the decrease in air pressure at higher elevations D. the cooling due to rainfall on windward side of a mountain