Time 80 mins Cell Biol Exam 1, SP 17 Ch 1, 8, 11 & 12 Points 75 38. In a eukaryo

Question

Time 80 mins Cell Biol Exam 1, SP 17 Ch 1, 8, 11 & 12 Points 75 38. In a eukaryotic gene regulation, the DNA packed in chromatin are made more ccessible to transe iption factors by a. Histone deacetyl b- Flippa se c Chromatin remodeling complex d. A and Care correct e Band Care correct 39. The gene expression can be propagated to daughter cells by b. Positive feedback memory c propagation of chromatin structure d. A and B are correct A, B and Care correct 40. Which of the following is not true about ONA methylation? DNA methylation usually occurs on Guanosine residue b, DNA methylation blocks gene expression Methylation is carried out by methyl transfe base paired with methylated Gc d Thr fnirme methylates C6 sequences that are

Explanation / Answer

1. histone deacetylase and chromatin remodelling complex

histone deacetylases also maintain S-phase chromatin and DNA replication fork progression

2. the gene expression can be propagated to daughter cells by DNA methylation patterns

3. option A is not true.

DNA methylation usually occurs at cytosine residues

4. presence of nucleus or nuclear membrane distinguishes an eukaryotic cell and a prokaryotic cell.

5. specialized cell types in the body of a multicellular organism are different from each other because different genes are turned on in different cell types (this is called cell specific gene regulation or epigenetic gene regulation)

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