Why is antigenic drift a problem for the immune system?
A. It requires a new, primary response by B
cells.
B. The ability of MHC to present antigen is
affected.
C. T cell receptors may not recognize the
altered antigen.
D. Two answer options are correct: It requires
a new, primary response by B cells AND T
cells may not recognize the altered antigen.
D
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You analyze two daughter cells of Bacteria A immediately after binary fission. Which of the following is ACCURATE about the daughter cells?
A. They have genetic contributions from two different parent cells. B. They are members of the same colony. C. They have genetically identical chromosomes. D. They are members of the same colony and have genetically identical chromosomes. E. They are members of the same colony and they have genetic contributions from two different parent cells.
During enzyme-catalyzed reactions, substrate is a synonym for:
a. end product b. byproduct c. enzyme d. reactant e. cofactor
You begin an experiment involving metabolic processes in human liver cells, but you discover your liver tissue samples have been contaminated with a strain of obligate anaerobic bacteria. Theoretically, how could you kill the bacteria while minimizing damage to the liver cells?
a. soak the tissue samples in pure ethanol b. put the sample through an autoclave c. expose the samples to gaseous oxygen d. dehydrate the tissue samples overnight
Which of the following are symbiotic fungi for 80–90 percent of vascular plant species?
a. Mycoses b. Lichens c. Yeasts d. Mycorrhiza