Which of the following statements is incorrect? Folic acid in food can serve as methyl-group donor for both histone and DNA methylation. Epigenome is dynamic and responds to environmental changes. Enzymes that catalyze DNA methylation can also catalyze histone methylation. For genes that are imprinted, deletion of the gene in the inactive parental allele is inconsequential.
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Madhur L.
23. Which of the following is NOT true of epigenetic gene regulation? A. It may involve methylation of DNA B. It may affect chromatin structure C. Epigenetic regulation patterns are never heritable D. It involves factors other than the DNA sequence itself E. It provides a way for the environment to influence a phenotype 24. Which of these is NOT true of DNA methylation? A. It is carried out by DNA methylase enzymes B. The main nucleotide involved is 5-methylthymidine C. It generally represses transcription D. It happens at groups of C's and G's (such as CGG or CCG) E. It can be detected using 2 restriction enzymes, one of which cuts the methylated sites, and one of which does not 25. Which of the following is NOT true of genomic imprinting? A. It differs in the male and female germ lines B. Methylated genes are inactive during embryogenesis C. Imprinting affects all embryonic genes equally D. Imprinting in one parent, combined with rare deletions in the other, can cause human diseases E. Imprints are erased early in sperm or egg development, then re-established
Shyam P.
71w) Which of the following chromosome statements regarding epigenetics is NOT true? B) DNA inactivation in female mammals is epigenetically controlled by hypermethylation. Usually, this leads to an inactive chromatin (which means silencing those genes located within that particular chromosomal region). Modified histone protein phosphorylation and methylation affect the chromatin state. D) None of the above.
Adi S.
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