Which of the following could represent an epigenetic modification in a cell?   A. Deletion of chromosome 18   B. Acetylation of histone H3   C. Deletion of a 20-nucleotide segment of chromosome 3   D. Conversion of an A to a T within a gene   E. Duplication of chromosome 13

An epigenetic study of maternal care in mice was used to study transgenerational epigenetic inheritance. This study found that A. Increased maternal care during childhood resulted in lower stress levels as adults and decreased maternal care with their own offspring B. Increased maternal care during childhood resulted in lower stress levels as adults and increased maternal care with their own offspring. C. Increased maternal care during childhood resulted in higher stress levels as adults and decreased maternal care with their own offspring. D. Increased maternal care during childhood resulted in higher stress levels as adults and increased maternal care with their own offspring.

Which of these is NOT true of nucleosomes?     A. Some post-translational modifications to histone proteins serve as binding sites for transcription factors.       B. The position of nucleosomes is fixed on the genome and can not be changed.       C. The position and post-translational modifications of histones can be inherited through mitosis.       D. The binding between DNA and histone proteins can be disrupted by post-translational modifications.

Which of the following is true about the enzyme telomerase?   A. It is found only in adult cells.   B. It is responsible for telomere shortening.   C. It can re-establish telomere length.   D. It may speed up the aging process.   E. It is expressed at low levels in cancer cells.

What would the correct answer be, please choose letter option and explain

Which of the following is not a major mechanism of epigenetic change? a. DNA methylation b. Alteration of a DNA base sequence in a promoter c. Histone acetylation d. Action of RNA molecules

Which of the following snRNPs facilitate the second transesterification reaction during mRNA splicing?    a. U6   b. U5   c. U4   d. U3

. Dosage compensation is necessary because a. some regions of the genome contain more genes than others.b. genes near heterochromatin tend to be silenced. c. enhancers can activate transcription whether they are upstream or downstream of a gene. d. genes on the X chromosome have twice as many copies in females as in males

Occasionally, a mouse X chromosome is broken into two pieces and each piece becomes attached to a different autosome. A scientist studies this cell, and finds that the genes on only one of the two pieces undergo inactivation. By referring to the mechanism of X-chromosome inactivation, explain the observation made by the scientist.

Control of gene expression in eukaryotic cells occurs at which level(s)? Lüffen birini seçin: a. epigenetic and transcriptional levels O b. post-transcriptional, translational, and post-translational levels O c. only the transcriptional level O d. epigenetic, transcriptional, post-transcriptional, translational, and post-translational levels O e. epigenetic, transcriptional, and translational levels