82. A researcher studying epigenetic changes in colorectal cancer identifies hypermethylation of the MLH1 gene promoter, leading to loss of DNA mismatch repair function. This methylation occurs at the 5-position of cytosine residues within CpG dinucleotides. Which molecule serves as the methyl group donor for this reaction? (A) Methylcobalamin (B) N5-Methyl-THF (C) S-Adenosylmethionine (D) Betaine (E) Choline

82. A researcher studying epigenetic changes in colorectal cancer identifies hypermethylation of the MLH1 gene promoter, leading to loss of DNA mismatch repair function. This methylation occurs at the 5-position of cytosine residues within CpG dinucleotides. Which molecule serves as the methyl group donor for this reaction?
(A) Methylcobalamin
(B) N5-Methyl-THF
(C) S-Adenosylmethionine
(D) Betaine
(E) Choline

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統計： A(0), B(2), C(2), D(0), E(0) #3853387

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2026/04/01

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13. Suppose a person begins breathing very rapidly while resting (hyperventilating), which of the following best describes how homeostasis is restored? (A) Rapid breathing decreases blood CO2 levels, thereby raising blood pH. The frontal cortex detects the change and reduces stimulation of the rib muscles and the diaphragm, thereby decreasing the breathing rate. (B) Rapid breathing increases blood CO2 levels, thereby causing the blood pH to drop. The hypothalamus detects the change and decreases stimulation of the rib muscles and the diaphragm, thereby reducing the breathing rate. (C) Rapid breathing decreases blood CO2 levels, thereby raising blood pH. The hypothalamus detects the change and reduces stimulation of the rib muscles and the diaphragm, thereby decreasing the breathing rate. (D) Rapid breathing increases blood CO2 levels, thereby causing the blood pH to drop. The medulla oblongata detects the change and reduces stimulation of the rib muscles and the diaphragm, thereby decreasing the breathing rate. (E) Rapid breathing decreases blood CO2 levels, thereby raising blood pH. The medulla oblongata detects the change and reduces stimulation of the rib muscles and the diaphragm, thereby decreasing the breathing rate.

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