Inherited mutations in the Xist promoter lead to defects in which epigenetic process?
A) RNAi
B) X-inactivation
C) genomic imprinting
D) position effect variegation
E) methylation of CpG islands
B
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Nitrogen-containing bases between two complementary DNA strands are joined by
(a) polar covalent bonds. (b) hydrogen bonds. (c) phosphate groups. (d) deoxyribose sugars.
The antibody-mediated immune response is
most effective against
a. cancer cells. b. viral infected cells. c. bacteria circulating in the blood. d. viral infected cells and cancer cells. e. bacteria circulating in the blood and viral infected cells
The most abundant gas in the earth's atmosphere is
a. oxygen. b. water vapor. c. argon. d. nitrogen. e. carbon dioxide.
Which term refers to a virus in the lysogenic cycle that is fully integrated into the host genome?
a. virulent phage b. infectious phage c. tempered phage d. prophage