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Ch. 16 - The Molecular Basis of Inheritance
Campbell - Campbell Biology 12th Edition
Urry12th EditionCampbell BiologyISBN: 9785794169850Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoUrry 12th EditionCh. 16 - The Molecular Basis of InheritanceProblema 9
Capitolo 16, Problema 9

Although the proteins that cause the E. coli chromosome to coil are not histones, what property would you expect them to share with histones, given their ability to bind to DNA (see Figure 5.14)?

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Understand the role of histones: Histones are proteins that help package DNA into structural units called nucleosomes, allowing the DNA to coil and fit within the cell nucleus. They achieve this by binding to DNA, which is negatively charged due to its phosphate backbone.
Identify the key property of histones: Histones are positively charged, which allows them to interact with the negatively charged DNA. This electrostatic attraction is crucial for the binding process.
Consider the proteins in E. coli: Although E. coli does not use histones, it uses other proteins to coil its chromosome. These proteins must also be able to bind to DNA effectively.
Determine the shared property: Given the need to bind to DNA, the proteins in E. coli likely share the property of being positively charged, similar to histones. This positive charge would facilitate the binding to the negatively charged DNA.
Connect the concept: The ability to bind to DNA through electrostatic interactions is a fundamental property shared by both histones and the proteins in E. coli, despite their structural differences.

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DNA Binding Proteins

DNA binding proteins are molecules that have the ability to attach to DNA sequences, influencing the structure and function of the DNA. These proteins often have specific domains that allow them to interact with the negatively charged phosphate backbone of DNA, facilitating processes like replication, transcription, and chromosomal organization.
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02:50
Proteins

Histones

Histones are proteins that play a crucial role in the organization of DNA in eukaryotic cells. They are positively charged, which allows them to bind tightly to the negatively charged DNA, helping to package it into a compact, organized structure called chromatin. This interaction is essential for DNA stability and regulation of gene expression.
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04:14
Histone Acetylation

Electrostatic Interactions

Electrostatic interactions are forces between charged particles, such as the attraction between positively charged proteins and negatively charged DNA. These interactions are fundamental in biological systems, as they help stabilize structures like the DNA-protein complexes, ensuring proper DNA packaging and accessibility for cellular processes.
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04:25
Interspecific Interactions
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Domanda del libro di testo

A biochemist isolates, purifies, and combines in a test tube a variety of molecules needed for DNA replication. When she adds some DNA to the mixture, replication occurs, but each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has she probably left out of the mixture?

a. DNA polymerase

b. DNA ligase

c. Okazaki fragments

d. Primase

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Domanda del libro di testo

E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two more generations (two rounds of DNA replication). DNA extracted from these cells is centrifuged. What density distribution of DNA would you expect in this experiment?

a. One high-density and one low-density band

b. One intermediate-density band

c. One high-density and one intermediate-density band

d. One low-density and one intermediate-density band

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Domanda del libro di testo

The spontaneous loss of amino groups from adenine in DNA results in hypoxanthine, an uncommon base, opposite thymine. What combination of proteins could repair such damage?

a. Nuclease, DNA polymerase, DNA ligase

b. Telomerase, primase, DNA polymerase

c. Telomerase, helicase, single-strand binding protein

d. DNA ligase, replication fork proteins, adenylyl cyclase

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