Histone tails can be modified to change the shape and "tightness" of the nucleosomes.Acetylated histones result in which effect?O Open DNA and increased transcriptionO Closed DNA and increased transcriptionO Open DNA and decreased transcriptionClosed DNA and decreased transcription

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Description: Histone tails can be modified to change the shape and "tightness" of the nucleosomes.Acetylated histones result in which effect?O Open DNA and increased transcriptionO Closed DNA and increased transcriptionO Open DNA and decreased transcriptionClose

Histone acetylation is the process of transfer acetyl group(functional group) to particular histone…

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Histone tails can be modified to change the shape and "tightness" of the nucleosomes. Acetylated histones result in which effect?

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter8: Dna Structure And Function

Section: Chapter Questions

Problem 5SA: In eukaryotic chromosomes, DNA wraps around _________. a. histone proteins c. centromeres b. sister...

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Describe the mechanism by which histone modifications are established after DNA replication and cell division. What are some things that could go wrong if modifications can't be maintained? Think about what histone modifications do to DNA and why cells maintain parts of their chromosome as heterochromatin.
Fill in the blank The ______ acts to position RNA polymerase II for transcription initiation. The enzyme _________ is important or releasing torsional stress during DNA replication ____________ of histone tails will neutralize their DNA binding resulting in decondensation of the chromatin.
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 is the expected outcome following the deacetylation of histones? a) Coiling of chromatin, preventing it from being accessed by transcriptional machinery b) Coiling of chromatin, allowing it to be accessed by transcriptional machinery c) Uncoiling of chromatin, preventing it from being accessed by transcriptional machinery d) Uncoiling of chromatin, allowing it to be accessed by transcriptional machinery
Heterochromatin and Euchromatin Have Which Different Histone modifications
The histone proteins help package DNA into ___________;the nonhistone proteins function in chromosomestructure, replication, and segregation, as well as in thecontrol of gene expression.
_____ is the combination of a seat, elation, another modifications to the histones that allow for changes in DNA winding and unwinding a. Epigentics b. Histone code c. Heterochromatin d. Post translational modifications
Match the type of chromatin modification with the most likely effect on gene expression near the modified region. Each answer will be used once. -Increased expression -decreased expression -may increase or decrease expression a)Histone acetylation b)Histone methylation c)CpG methylation
Which one of the following statements about nucleosomes is false? a) The DNA double helix wraps around the nucleosome. b) The sequence of amino acid in a histone tail is altered during chromatin remodeling. c) A nucleosome is composed of 8 histone proteins; two copies of each type of histone. d) A large percent of the nucleosome is positively charged.
. Gene expression in mammals can be increased by which of the following mechanisms? X-chromosome inactivation (as in the case of the female tortoiseshell cat) histone dephosphorylation histone methylation histone deacetylation E. histone phosphorylation
Which statement/s is/are TRUE about transcription?A. During transcription, DNA polymerase binds to RNA and separates the DNA strands.B. RNA polymerase uses one strand of DNA as a template to assemble nucleotides into a strand of RNA.C. RNA polymerase binds only to DNA promoters, which have specific base sequences.D. Promoters are signals in RNA that indicate to RNA polymerase where to begin transcription.E. Transcription occurs in the 3’ to 5’ direction with respect to the growing mRNA strand.
In eukaryotes, chromatin remodeling plays an important role is gene regulation. This is because a. repositioning of the nucleosomes makes DNA accessible to transcription regulatory proteins b. the nucleosomes contain important regulatory regions c. chromatin remodeling activates gene expression d. chromatin remodeling represses gene expression