Which of the following observations give support to the idea that changes in chromatin structure affect gene activity? nucleosome removal near active genes position effect variegation formation fo Barr bodies in mammals all of the above

Which of the following observations give support to the idea that changes in chromatin structure affect gene activity? nucleosome removal near active genes position effect variegation formation fo Barr bodies in mammals all of the above

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter9: From Dna To Protein

Section: Chapter Questions

Problem 1SQ: A chromosome contains many different genes that are transcribed into different ___ . a. proteins b....

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Question

Which of the following observations give support to the idea that changes in chromatin structure affect gene activity?
nucleosome removal near active genes
0000
position effect variegation
formation fo Barr bodies in mammals
all of the above

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Which of the following is a type of chromatin remodeling? O the changing of amino acid sequence of histones the changing of chromatin binding sites in the genome O the changing of nucleosome position the changing of nucleotide sequences of the genome
Which of the following statements concerning eukaryotic chromatin is true. Histones have an overall negative charge. Euchromatin is more condensed then heterochromatin. After replication nucleosomes are made up of a mixture of old and new histone proteins. Euchromatin is associated with the centromere and telomere regions. Heterochromatin are regions of active transcription.
The following image shows the 'beads-on-a-string' model of DNA and the effects of histone modification on chromatin structure. What effect does histone acetylation have on Gene 1? Gene 1 De-acetylation Acetylation Ac Ac Gene 1 Ac Ac Ac O Acetylation increases expression of Gene 1 O Acetylation decreases expression of Gene 1 O Acetylation causes a mutation in Gene 1 O There is no way to tell from this figure
Which of the following is likely to be transcriptionally expressed? euchromatin and DNA with methyl groups euchromatin DNA with methyl groups DNA with acetylated histones euchromatin and DNA with acetylated histones
In eukaryotes which of the following combination of chromatin conditions would be most likely to result in the highest levels of expression of gene?
All of the following statements regarding nucleosomes are true EXCEPT A each bead-like structure contains 8 molecules of histones H1, H2A, H2B, H3 and H4 the bead like structures are made up of core histones wrapped around by the DNA strands the histone proteins in the nucleosomes contain positively charged amino acids that interact with the negatively charged DNA D the bead like structures are linked to each other by the DNA chain
In studies on chromatin it has been reported that DNA that is being actively transcribed is more sensitive to digestion by DNase I. Which of the following events is known to make DNA more sensitive to digestion by DNase I? Formation of heterochromatin DNA methylation All of the provided answers are correct. Acetylation of histone O Deacetylation of histone
A chromosome contains many different genes that are transcribed into different ___ . a. proteins b. polypeptides c. RNAs d. a and b
Chromatin decompaction is a preliminary step in gene expression (Figure 29.48). How is chromatin decompacted?
Which of the following statements correctly describes the structure of chromatin around the promoter of an active eukaryotic gene? O A. It is in the form of heterochromatin and the nucleosomes are tightly wrapped. O B. It is in the form of euchromatin and the nucleosomes are cleared from the region allowing for an open and accessible configuration OC.A repressor protein is bound to the chromatin blocking RNA polymerase. O D.Both B and C.
The diagram below shows the structure of DNA from the level of a gene to a condensed mitotic chromosome. At each of the four locations marked, indicate how a gene may be regulated by selecting from the choices given. Some answer choices may fit into more than one position; however, you should use each answer choice only once. Choices given: Alternative splicing within the gene sequence can lead to different forms of mRNA. A promoter region can be blocked by another protein. Histone deacetylation can prevent DNA from unwinding. A regulatory region can be bound and increase transcription rates.
Which of the following statements about heterochromatin is FALSE? It contains many repeated sequences, but few actively transcribed genes. It remains condensed through most of the cell cycle. It is found next to the centromeres and on short arms in human chromosomes. It is enriched for transposable elments Histone proteins in heterochromatin are heavily acetylated, reducing their affinity for the DNA backbone.