Bacterial transduction begins when a kind of virus called a ___________________ infects a bacterial cell.
a. transformer
b. transducton
c. T-cellvirus
d. bacteriophage
Ans: d. bacteriophage
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What will be an ideal response?
Some human diseases are more abundant in small populations due to genetic drift.
a. true b. false
In the absence of repair, what would the replication of a double helix containing a mismatch yield?
A. two DNA molecules containing different mismatches at the site of the original error B. two DNA molecules with a mutated sequence C. one DNA molecule with the normal sequence and one DNA molecule with a mutated sequence D. two DNA molecules containing the mismatch E. one DNA molecule with the normal sequence and one DNA molecule with a mismatch
The protozoan that causes malaria is an intracellular parasite of red blood cells (RBCs). An adaptive immune response to this parasite is problematic because
A) red blood cells do not produce MHC and, therefore, do not display the fact that they have been infected by presenting antigen. B) the parasite damages leukocytes along with RBCs. C) RBCs normally produce cytokines necessary for adaptive immune response, which this infection prevents. D) complement cannot effectively destroy RBCs. E) RBCs never enter lymphoid tissue.