Question

onaformation from a ee is used in the synthesisof 17 functional gene product. A) Geno B) Gene regulation C) Epigenetics D) Imprinting E) Chromatin remodeling 18. A histone code is the: A) B) nucleotide sequence of an individual histone protein's gene. pattern of chemical modification of the DNA wrapped around an individual histone. C) D) E) pattern of chemical modification of the histone tails. number of amino acids in an individual histone that are methylated None of the other answer options is correct. 19. Sex-specific silencing of gene expression is known as: A) X-inactivation. B) methylation. C) chromatin remodeling. D) imprinting E) None of the answer options is correct 20. A CpG island is: (Select all that apply.) a stretch of nucleotides with many C bases adjacent to G bases in the promoter site of a gene. a stretch of nucleotides with many C bases adjacent to G bases found anywhere along a DNA strand a stretch of nucleotides with many C bases adjacent to G bases found near bacterial operons in a small region near A) B) C) or 21. Many genes have multiple enhancer sequences. The multiple enhancer sequences allow multiple A) options for alternative splicing of the RNA transcript. B) options for RNA editing of the RNA transcript. C) transcription factors to control gene expression. D) proteins to be made from the same protein-coding gene E) None of the answer options is correct 22. Alternative splicing may be considered a mechanism of gene regulation because it: A) results in DNA rearrangements. B) enhances RNA editing. c) results in different protein products D) is mutagenic.

Answer 1

Ans 17:- (A) Gene Expression.

Explanation:- The process by which the information present in the gene is used to produce the functional gene product is called the Gene expression, the gene products are proteins which are used by the body for various functions in some genes the information is converted to transfer RNA called tRNA.

Ans 18:- (C) Pattern of chemical modification of the histone tails.

Explanation:- histone code is defined as the set of histone modification that dictates whether the chromatin is open or closed it occurs on the tails. Histone code can control Gene Expression.

Histone code and their regulatory functions.

H4 K8 acetylation, H3 K14 acetylation, H3 S10 phosphorylation = transcription

H3 K9 trimethylation, NO H3 or H4 acetylation = transcriptional repression

H4 K4 acetylation H4 K12 acetylation = histone deposition at S-phase

H2A S1 phosphorylation, H2A T119 phosphorylation, H3 T3 phosphorylation, H3 S10 phosphorylaton, H3 S28 phosphorylation = condensed mitotic chromatin.

Ans 19:- (D) Imprinting.

Explanation:- Imprinting is defined as an epigenetic phenomenon that causes the genes to get express in a parent of origin-specific manner. In very simple language to make it understand we know offspring inherit two copies of genes from their parents i.e, one from mother and one from father however in usual case both genes are active whereas in some cases only one of the two copies are activated or expressed so which copy is switched on will depend on parent of origin, either from father or mother this process is called Imprinting.

Ans 20:- (A) a stretch of nucleotides with many C bases adjacent to G bases in a small region near or in the promoter site of a gene.

Explanation:- CpG in mammalian genomes are typically 300-3000 bp in length and have been found in or near approximately 40% of promoters of mammalian genes.