Immediate hypersensitivity is ________ mediated, and delayed type hypersensitivity is ________ mediated
a. antibody / cell
b. cell / antibody
c. Th1 / IgE
d. IgG / Th2
Answer: A
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Contact inhibition is best explained by which of the following statements?
a. Contact between neighboring cells triggers reactions leading to inhibition of mitosis. b. As neighboring cells become more tightly packed together, their size is restricted and cytokinesis can no longer occur. c. As cell number increases, the protein kinases they produce compete with neighboring cells, inhibiting mitosis. d. As cell number increases, the level of waste products increase, consequently slowing metabolism leading to mitosis. e. As cell number increases, size restrictions inhibit protein synthesis.
In the Hardy-Weinberg equation, the term q2 refers
to the frequency of a. a recessive allele of a given locus. b. the homozygous recessive genotype at a given locus. c. recessive alleles in a population. d. heterozygotes in a population. e. alleles in the gene pool.
Tubular secretion takes place in the ____
a. glomerulus b. Bowman’s capsule c. loop of Henle d. distal tubules e. collecting ducts
A distinctive feature of eukaryotes is the organization of tightly packaged chromosomal DNA with proteins into a membrane-bound structure called a:
A. nucleus. B. cell. C. plasma membrane. D. nucleolus.