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Ch. 3 Cells: The Living Units
Marieb - Human Anatomy & Physiology 11th Edition
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMarieb, Hoehn 11th EditionCh. 3 Cells: The Living UnitsProblema 6
Capitolo 3, Problema 6

The nuclear substance composed of histone proteins and DNA is:
a. Chromatin
b. The nucleolus
c. Nucleoplasm
d. Nuclear pores

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1
Understand the components of the cell nucleus: The nucleus contains DNA, proteins, nucleolus, nucleoplasm, and nuclear pores, each with distinct functions.
Recall that DNA in the nucleus is wrapped around proteins called histones to form a complex substance that helps organize and compact the DNA.
Identify that this complex of DNA and histone proteins is known as chromatin, which is the material that makes up chromosomes during cell division.
Recognize that the nucleolus is a dense region within the nucleus involved in ribosomal RNA synthesis, not the DNA-protein complex.
Note that nucleoplasm is the fluid inside the nucleus, and nuclear pores are openings in the nuclear envelope, so neither refers to the DNA-histone complex.

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Chromatin

Chromatin is the complex of DNA and histone proteins found in the nucleus of eukaryotic cells. It packages DNA into a compact, organized structure, allowing efficient regulation of gene expression and DNA replication.
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Percorso guidato
03:54
Prophase

Histone Proteins

Histones are positively charged proteins around which DNA winds to form nucleosomes, the basic units of chromatin. They play a key role in DNA packaging and gene regulation by controlling access to genetic information.
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Percorso guidato
02:50
Proteins

Nuclear Components

The nucleus contains several components: nucleoplasm (the fluid matrix), nucleolus (site of ribosome synthesis), and nuclear pores (channels for molecular transport). Understanding these helps distinguish chromatin from other nuclear structures.
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Optic Components
Pratica correlata
Domanda del libro di testo

Membrane junctions that allow nutrients or ions to flow from cell to cell are:

a. Desmosomes

b. Gap junctions

c. Tight junctions

d. All of these

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Domanda del libro di testo

The phase of mitosis during which centrioles reach the poles and chromosomes attach to the spindle is

a. Anaphase

b. Metaphase

c. Prophase

d. Telophase

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Domanda del libro di testo

The information sequence that determines the nature of a protein is:

a. Nucleotide

b. Gene

c. Triplet

d. Codon

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The major types of lipids found in the plasma membranes are (choose two):

a. Cholesterol

b. Triglycerides

c. Phospholipids

d. Fat-soluble vitamins

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Domanda del libro di testo

The RNA synthesized on one of the DNA strands is:

a. mRNA

b. tRNA

c. rRNA

d. all of these.

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Domanda del libro di testo

Osmosis always involves:

a. A selectively permeable membrane

b. A difference in solute concentration

c. Diffusion

d. Active transport

e. a, b, and c

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