Which of the following statements about evolutionary adaptation is true?
A) An individual who has learned how to survive cold winters has become adapted to the cold.
B) A population that has an increase in frequency of alleles for thicker fur has become adapted to the cold.
C) Adaptation results when cold temperatures cause mutations for longer fur.
D) Adaptation is possible when all the alleles in a gene pool are the same.
Answer: B
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Lipids are characterized primarily on the basis of their insolubility in _________
Fill in the blank(s) with correct word
If a T cell is exposed to a "hidden" antigen, what kind of immune reaction will result?
A) an autoimmune disease B) a delayed hypersensitivity reaction C) a cytotoxic hypersensitivity reaction D) allergic contact dermatitis E) an allergy
The crescent-shaped structure of PUF proteins reveals two extended surfaces. Based on the location and effects ofmutations, one surface probably binds to regulatory proteins and the other surface probably binds to:
A. ribosomal proteins increasing the association of ribosomes to the 5' end of the ribosome tRNA binding site. B. specific sequences in the 3' UTR of mRNA. C. the nuclearAAUAAA polyadenylation sequence. D. the peptidyl (P) site on the 40Sribosomal subunit.
IgE molecules involved in hypersensitivity reactions have become attached to
A. neutrophils. B. mast cells. C. B cells. D. macrophages. E. mast cells AND B cells.