RNA molecules differ from DNA molecules because only RNA
A. has ribose.
B. does not have thymine.
C. is typically one strand of nucleotides.
D. has uracil.
E. All of the choices are correct.
Answer: E
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Environmental genomics is sometimes called metagenomics.
Answer the following statement true (T) or false (F)
The primary male hormone is
a. produced throughout a male's entire lifetime. b. testosterone. c. estrogen. d. only involved in sperm production. e. produced in the brain.
The defensive mechanisms that target specific pathogens are called ____________ defenses. These responses involve the white blood cells called ____________ .
Fill in the blank(s) with the appropriate word(s).
The difference between T cell activation by normal antigens and T cell activation by superantigens is that superantigens
A) suppress cytokine release. B) are not processed and presented by APCs. C) are not processed and presented by APCs and cause nonspecific activation of many T cells at once, including those that would not normally recognize the antigen. D) cause nonspecific activation of many T cells at once, including those that would not normally recognize the antigen and suppress cytokine release. E) cause nonspecific activation of many T cells at once, including those that would not normally recognize the antigen.