Chromosomescore of 8are composed of17forming a structure called achromatin; DNA: histones; nucleosomenucleosomes; DNA; chromatin: histoneODNA; chromatin; nucleosomes: histonewhich is composed ofwrapped around a Histones can be regulated by two classes of enzymes. One set of enzymes, calledaccessible to genetransfer acetyl groups to histones and cause chromatin to becomeexpression machinery.O HDACs; moreOHDACs: lessOHATS; more

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Chromosomes core of 8 are composed of 1. forming a structure called a chromatin; DNA; histones; nucleosome nucleosomes; DNA; chromatin: histone which is composed of O DNA; chromatin; nucleosomes: histone wrapped around a

Chromosomes core of 8 are composed of 1. forming a structure called a chromatin; DNA; histones; nucleosome nucleosomes; DNA; chromatin: histone which is composed of O DNA; chromatin; nucleosomes: histone wrapped around a

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter10: Cell Division And Mitosis

Section: Chapter Questions

Problem 1ITD: Biologists have long been interested in the effects of radiation on cells. In one experiment,...

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Concept explainers

Oogenesis

The formation of the ovum (mature female gamete) from undifferentiated germ cells is called oogenesis. This process takes place in the ovaries (female gonads). Oogenesis consists of three stages known as the multiplication phase, growth phase, and maturation phase.

Cell Division

Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons:

Question

Chromosomes
core of 8
are composed of
17
forming a structure called a
chromatin; DNA: histones; nucleosome
nucleosomes; DNA; chromatin: histone
ODNA; chromatin; nucleosomes: histone
which is composed of
wrapped around a

Histones can be regulated by two classes of enzymes. One set of enzymes, called
accessible to gene
transfer acetyl groups to histones and cause chromatin to become
expression machinery.
O HDACs; more
OHDACs: less
OHATS; more

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A region of a eukaryotic chromosome that is gene-rich (i.e. contains many genes) would be expected to be in which form chromatin form? Euchromatin O Heterochromatin
One histone modification that is seen consistently inmany species is the addition of an acetyl group to thetwelfth lysine in the H4 protein. If you were a geneticist working on yeast and had a clone of the H4 gene,what could you do to test whether the acetylation atthis specific lysine was necessary for the functioningof chromatin?
I. The retinoic acid receptor (RAR) is a transcription factor that is similar to steroid hormone receptors. Thesubstance (ligand) that binds to this receptor is retinoicacid. One of the genes whose transcription is activatedby retinoic acid binding to the receptor is myoD. Thediagram that follows shows a schematic view of theRAR proteins produced by genes into which one oftwo different 12-base double-stranded oligonucleotides had been inserted in the ORF. The insertion site(a–m) associated with each mutant protein is indicatedwith the appropriate letter on the polypeptide map.For constructs encoding proteins a–e, oligonucleotide 1(5′ TTAATTAATTAA 3′ read off either strand) wasinserted into the RAR gene. For constructs encoding proteins f–m, oligonucleotide 2 (5′ CCGGCCGGCCGG 3′)was inserted into the gene.NH2 f g h i j k l m COOHa b c d eThe wild-type RAR protein can both bind DNA and activate transcription weakly in the absence of retinoic acid(RA) and strongly in RA’s presence. Each…
Give at least one example of a chromosomal structureor function affected by the following mechanisms formodulating chromatin structure:a. Posttranslational changes of the normal histonesfound in the nucleosome
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