There can be more than one answer. Which of the following statements regarding nucleosomes are correct?A nucleosome consists of 147bp of DNA wrapped 1.67-times around 8 core histonesO The N-terminal histone tails are subject to post-translational modificationO Once a nucleosome has been formed its structure and position are irreversibleO Nucleosomes only exist in mitotic chromosomes

In eukaryotes, a nucleosome is the essential structural unit of DNA packaging. A nucleosome is made…

Which of the following statements regarding nucleosomes are correct? O A nucleosome consists of 147bp of DNA wrapped 1.67-times around 8 core histones The N-terminal histone tails are subject to post-translational modification O Once a nucleosome has been formed its structure and position are irreversible O Nucleosomes only exist in mitotic chromosomes

Which of the following statements regarding nucleosomes are correct? O A nucleosome consists of 147bp of DNA wrapped 1.67-times around 8 core histones The N-terminal histone tails are subject to post-translational modification O Once a nucleosome has been formed its structure and position are irreversible O Nucleosomes only exist in mitotic chromosomes

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter6: Dna Structure And Function

Section: Chapter Questions

Problem 6SQ

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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
Which of the following statements is TRUE? O Interphase chromosomes are loosely compacted, overlapping, and intertwined with each other within the nucleus. O Interphase chromosomes are loosely compacted and do not associate with histones until the cell is preparing to divide. O Interphase chromosomes are also known as euchromatin. Condensed, metaphase chromosomes are also known as heterochromatin. O Radial loops in the condensing chromosome are formed due to interactions between 30 nm fibers and the scaffolding proteins of the nuclear matrix - producing the 300 nm fiber of the chromosome O None of these are TRUE
Which of the following is a common histone, but NOT part of the nucleosome core particle? O H1 OH4 O H2 O H3 O H5
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.
Which of the following does not contribute to genetic variation in sexually reproducing species? O a. random fertilization O b. independent assortment Oc cytokinesis O d. none of the answers are correct none of the answers are correct O e. crossing over All of the following correctly describe the sodium-potassium pump EXCEPT: O a. A total of five binding sites are present in the sodium-potassium pump O b. Potassium ions are pumped into the cell, where they are present in lower concentration than the extracellular fluid O c. The transport proteins will undergo some conformational changes O d. Molecules are pumped from low concentration to high concentration O e. Energy is required for the process to take place
Which one of the following statements is NOT true of histones? O They are involved in the packaging of eukaryotic chromatin. O They are highly conserved. O They are positively charged. They contain high amounts of arginine and lysine. O DNA double-wraps around seven histone proteins.
Which of the following statements is TRUE? None of these are TRUE Interphase chromosomes are loosely compacted, overlapping, and intertwined with each other within the nucleus. Radial loops in the condensing chromosome are formed due to interactions between 30 nm fibers and the scaffolding proteins of the nuclear matrix - producing the 300 nm fiber of the chromosome Interphase chromosomes are loosely compacted and do not associate with histones until the cell is preparing to divide. Interphase chromosomes are also known as euchromatin. Condensed, metaphase chromosomes are also known as heterochromatin.
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 the following diagram, what is the correct term for the structures indicated by letter B? O histones B Onucleosome O linker DNA GRUN 30 nm Chromatin Fiber D C B Jule
Chromatin of eukaryotes is organized into repeating interactions with protein octamers called nucleosomes. Nucleosomes are composed of DNA and multiple histone proteins cohesins telomerase kinetochore proteins
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.
How many types of histone proteins are present in eukaryotic chromatin? 3 O7 4