Concept explainers
A nucleosome consists of (a) DNA and scaffolding proteins (b) scaffolding proteins and histones (c) DNA and histones (d) DNA, histones, and scaffolding proteins (e) histones only
Introduction: A chromosome is a thread-like structure made up of DNA. It is tightly packed in the nucleus of a cell. Humans normally have 23 pairs of chromosomes.
Answer to Problem 1TYU
Correct answer: A nucleosome consists of DNA and histones. Hence, the correct answer is option (c).
Explanation of Solution
Reason for the correct answer:
The nucleosome is the basic unit of chromatin structures. The basic unit of each nucleosome contains a bead-like structure that has 146 DNA base pairs wrapped around the disc-shaped core of eight histone molecules. The nucleosomes prevent the DNA from becoming tangled. Histones play an important part in the regulation of gene expression.
Option (c) is given as “DNA and histones”.
The nucleosome consists of DNA and histones.
Hence, the correct answer is option (c).
Reasons for the incorrect answers:
Option (a) is given as “DNA and scaffolding proteins”.
Nucleosomes consist of DNA, but scaffolding proteins are not present in nucleosomes.
Hence, option (a) is incorrect.
Option (b) is given as “scaffolding proteins and histones”.
Scaffolding proteins are modular proteins that play a crucial role in cell-signaling pathways. Scaffolding proteins are not present in nucleosomes. Histones proteins are present in nucleosomes.
Hence, option (b) is incorrect.
Option (d) is given as, “DNA, histones, and scaffolding proteins”.
Nucleosomes consist of DNA and histones, but scaffolding proteins are not present. Hence, option (d) is incorrect.
Option (e) is given as, “histones only”.
Not only histones, but DNA is also present in the nucleosomes.
Hence, option (e) is incorrect.
Hence, options (a), (b), (d), and (e) are incorrect.
The nucleosome is the basic unit of chromatin structures that consist of DNA and histones.
Want to see more full solutions like this?
Chapter 10 Solutions
Biology (MindTap Course List)
- Which of the following best describes the difference between interphase and mitosis? a) During interphase, DNA has a loose structure that condenses during mitosis. b) During interphase, histones help compact DNA into chromosomes. And once mitosis starts, histones are destroyed. c) During interphase, DNA is tightly packed into chromosomes that uncoil once mitosis starts. d) During interphase, DNA is packed as chromosomes. And during mitosis, DNA is called chromatin. Please I need a surely answer and a quicker responsearrow_forwardThe inner nuclear membrane is lined by the nuclear lamina, a filamentous network which serves as an attachment site for chromatin and structural support and possibly other functions. a) True b) Falsearrow_forwardThe centrosome is a type of Microtubule Organisation Centre. A centrosome contains a pair of (a)______ . A centriole consists of stable fused (b) _________ Centrosomes form at the (c)_____________ of cells. (d) _________ microtubules attach the centrosome to the (e)___________.arrow_forward
- Which of the following is the main reason why DNA must exist in chromosome form? a.)To favor the formation of sister chromatids b.)To allow the protein histones to carry out its task c.)To avoid the genetic material to be tangled away during cell division d.)To promote the formation of spindle fibersarrow_forwardWhen the nuclear membrane reforms and the DNA loosely coils into chromatin a) prophase b) metaphase c) anaphase d) telophasearrow_forwardWhich of the following statements about eukaryotic chromosomes is false? (a) eukaryotic chromosomes have free ends (b) telomeres contain protein-coding genes (c) telomerase lengthens telomeric DNA (d) telomereshortening may contribute to cell aging (e) cells with active telomerase may undergo many cell divisionsarrow_forward
- Chromatin is differentiated into heterochromatin and euchromatin regions, on the basis of staining behaviour in a typical nucleus. Which of the given statements is/are correct w.r.t. heterochromatin? (A) Lightly stained region (B) Chromatin is densely packed (C) Transcriptionally it is inactive (D) Darkly stained region 1. (A) only 2. (A) and (C) only 3. (A), (B) and (C) 4. (B), (C) and (D)arrow_forwardWhich of the following proteins served as checkpoints in each stage of Interphase? a.)Ketose and Kinases b.)Kinases and Cyclins c.)Cyclins and Histones d.)Histones and Kinasesarrow_forwardWhich of the following does not occur during interphase? (a) (b) (c) (d) DNA is replicated. Spindle fibres form. New organelles are formed. The cell size increases.arrow_forward
- NEED HELP What structure do animal cells have, and that plant cells do not have, that aids in Mitosis? Explain. a) nucleus b) centriole (c) spindle fibers d) chromatidsarrow_forwardWhich of the following does not occur during mitosis? (a) (b) (c) (d) Chromatin condenses and forms chromosomes. Chromosomes move to the equator of the cell. Spindle fibres pull homologous chromosomes to opposite poles of the cell. Two new nuclei are formed that have two full sets of genetic information.arrow_forwardYou discover a substance that prevents the motor protein in a centromere from attaching to a spindle fiber. What would be a consequence of adding this substance to a cell during mitosis? Group of answer choices A) the chromatin would not coil up to form condensed chromosomes B) the nuclear membrane would not break down C) sister chromatids would not form D) sister chromatids would fail to separatearrow_forward
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education