Members of the group A streptococci (GAS) cause all of the following EXCEPT
A) strep throat.
B) scarlet fever.
C) rheumatic fever.
D) pharyngitis.
E) epiglottitis.
E
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Which of the following is not a role for methylation?
A. Methylation can protect bacterial RNA from restriction enzymes that are used to destroy viral DNA. B. Methylation of DNA can act as an inhibitor of gene expression. C. Methylation of DNA can enhance binding of certain proteins. D. Methylation is important in directing mismatch repair to repair the correct DNA strand. E. Methylation in eukaryotes can affect the formation of Z-DNA.
The open ocean is a(n) ________ environment.
A. oligotrophic B. phylotrophic C. eutrophic D. neotrophic
To infect a cell, HIV must
A. bind both CD4 and a cytokine co-receptor. B. bind both CD8 and a cytokine co-receptor. C. bind both CD8 and a class I MHC protein. D. kill cytotoxic T cells and bind CD4.
The sarsaparilla plant survives in a dense forest because it
a. becomes dormant. b. destroys competing plants. c. has broad leaves. d. is very tall.