Which immune system(s) are absent in individuals with severe combined immunodeficiency?
a. innate
b. cell-mediated
c. antibody-mediated
d. antibody-mediated and cell-mediated
e. inflammatory response
d
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What can happen if an enzyme is altered, even slightly?
A) It will continue to catalyze reactions, but at a slower rate. B) It will still catalyze reactions, but only at a higher temperature. C) The amount of activator required to "turn on" the enzyme will need to increase. D) Its active site may change, causing the enzyme to stop functioning. E) It will catalyze reactions too quickly, potentially causing illness for the individual.
You arrive late to a biological seminar. However, just as you enter the room, you hear the speaker referring to the "five-prime end" and the "three-prime end" of a macromolecule. Immediately, you know that they are talking about a:
A. carbohydrate. B. protein. C. DNA. D. lipid.