Genetics: From Genes to Genomes
Genetics: From Genes to Genomes
6th Edition
ISBN: 9781259700903
Author: Leland Hartwell Dr., Michael L. Goldberg Professor Dr., Janice Fischer, Leroy Hood Dr.
Publisher: McGraw-Hill Education
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Chapter 12, Problem 2P

Many proteins other than histones are found associated with chromosomes. What roles do these nonhistone proteins play? Why do chromosomes have more different types of nonhistone than histone proteins?

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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
Histones contain many basic amino acids including lysine. DNA and histones collectively form chromatin. Open chromatin is much more open and accessible to the transcriptional machinery than closed chromatin. Histone lysine acetylation is associated with open chromatin and occurs near genes that are being actively transcribed. Part A Given what you know about the chemical properties of DNA and the function of histones. whv do histones contain so many basic amino acids? Answer in no more than two sentences. Part B Given what you know about how acetylation affects lysine, why does histone lysine acetylation open chromatin? Answer in one sentence only.
In eukaryotic cells, the DNA is tightly packed in the form of chromatin. His- tones are positively charged proteins. Negatively charged DNA wraps tightly around these proteins to form nucleosomes. Additionally, there are other mechanisms for the compaction of chromatin. (a) Which histone(s) are critical for higher-order chromatin structure? (b) What are the non-histone proteins responsible for structural maintenance of chromosomes? (c) To initiate transcription, compact DNA must partially unwind. Explain the role of histones in this process. (d) Micrococcal nuclease can cleaves DNA at sites where it can access DNA without any specificity of binding to a particular sequence. If chromatin is digested with this nuclease, even for longer periods, a uniform length of 146 bp DNA fragments will be formed. Explain.

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Genetics: From Genes to Genomes

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