Are plant nuclei always larger than animal nuclei?
a. Yes
b. No
b
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What cytokine stimulates plasma cell secretion of IgE and IgG, and increases the number of class II MHC molecules on B cells and macrophages?
A) interleukin-4 B) interferon- C) interferon- D) interleukin-5 E) interleukin-10
An examination of fossil records shows that three modern species all had a common ancestor. This is an example of
A. polyploidy. B. divergent evolution. C. convergent evolution. D. three subspecies.
The term ________ is given to any foreign substance that stimulates a specific immune system response.
Fill in the blank(s) with the appropriate word(s).
Which is characteristic of codons (Select all that apply)?
a. are three-base sequences of mRNA b. are complementary to anticodons c. are base triplets d. code for amino acids e. are three-base sequences of tRNA