In eukaryotes, actively transcribed chromatin is 1. DNase insensitive. 2. in a h
ID: 99252 • Letter: I
Question
In eukaryotes, actively transcribed chromatin is 1. DNase insensitive. 2. in a highly condensed form 3. usually DNase sensitive. 4. sometimes referred to as heterochromatin. The term "chromatin remodeling" refers to 1. alteration of chromatin structure in association with transcription. 2. a process that only bacteria perform since they contain no nucleus. 3. a process that is exclusively associated with transcription by reverse transcriptase in eukaryotes. 4. alteration in chromatin structure to facilitate loading and translation by ribosomes and, thus, enhance gene expression. What modification neutralizes the charges on histones and loosens up the interactions between histones and DNA? 1. phosphorylation 2. Methylation 3. Acetylation 4. polyadenylation When comparing regulation of gene expression in eukaryotes versus prokaryotes, which of the following processes seems to be the most similar between the two? 1. transcription. 2. RNA splicing regulation. 3. intron/exon shuffling. 4. 5'-capping.Explanation / Answer
7) Answer is :3. usually DNase sensitive.
8) answer is : 1. alteration of chromatin structure in association with transcription.
Chromatin remodeling is called modification of chromatin structure that allow access of condensed genomic DNA to the regulatory transcription machinery protein so control gene expression.
9) answer is 3. Acetylation
Acetylation process is the attachment of the acetyl group. It makes the histone less positive and it loosen the grip on the DNA.
10) Answer is : 1. transcription.
There are many similarities, for example:
- The active center is conserved in both prokaryote and eukaryotes
- In both ,transcription begins with the binding of transcription factors to the promoter site on the DNA