Which of the following is the result when a CTL interacts with a virally infected cell?
A) The cell releases interferon-gamma (INF-?).
B) The cell undergoes apoptosis.
C) The CTL produces oxidizing chemicals.
D) The CTL produces IL-12.
E) The cell produces MHC II with epitope attached.
B
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During receptor-mediated endocytosis
a. plasma membrane receptors bind molecules to be enclosed. b. a small pit forms beneath the receptors. c. a pit closes back on itself. d. a vesicle forms. e. all of these occur.
An antigen is any substance that triggers an immune response
a. true b. false
Comb shape in chickens represents one of the classic examples of gene interaction. Two gene pairs interact to influence the shape of the comb. The genes for rose comb (R) and pea comb (P) together produce walnut comb
The fully homozygous recessive condition (rrpp) produces the single comb. Assume that a rose-comb chicken is crossed with a walnut-comb chicken and the following offspring are produced: 17 walnut, 16 rose, 7 pea, 6 single. (a) What are the probable genotypes of the parents? (b) Give the genotypes of each of the offspring classes.
Which of the following foods would be least likely to contribute to the development of heart disease?
A) margarine B) butter C) bacon D) fish oil