The Question is from neet-botany cell-biology , and it was created by the author D VINOD

Question

Histone proteins are rich in which of the following amino acids?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Amino acid composition of histone proteins
 **Related Topics**: Protein structure, chromatin, DNA packaging
 **Prerequisites**: Basic understanding of amino acids and their properties (polarity, charge)
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the amino acid composition of histone proteins.
  Options provide pairs of amino acids.
**Method & Steps**:
 1. Identify the characteristics of histone proteins.
  Reasoning: Histone proteins are highly basic proteins that interact with negatively charged DNA.  This interaction is crucial for DNA packaging into chromatin.
 2. Determine which amino acids contribute to the basic nature of histones.
  Working: Basic amino acids possess positively charged side chains at physiological pH. Lysine and arginine are positively charged amino acids.
  Key Point: The positive charge on lysine and arginine allows them to form strong ionic bonds with the negatively charged phosphate backbone of DNA.
 3. Evaluate the given options.
  Result: Option A (Lysine and Arginine) correctly identifies the amino acids responsible for the basic nature of histone proteins.
  Verification: The abundance of lysine and arginine explains the strong interaction between histones and DNA.
 ## OPTION ANALYSIS
A ✓: Lysine and Arginine are basic amino acids with positively charged side chains. Their abundance in histone proteins allows for strong electrostatic interactions with the negatively charged DNA.
B :x: Glycine and alanine are nonpolar amino acids and do not contribute significantly to the basic nature of histones.
C :x: Tryptophan and phenylalanine are aromatic amino acids and are not known for their contribution to the basic nature of histones.
D :x: Cysteine and methionine are not known for their high abundance in histone proteins, and cysteine has a polar but not positively charged side chain.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing basic and acidic amino acids: Remember that basic amino acids have positively charged side chains (Lysine, Arginine, Histidine), while acidic amino acids have negatively charged side chains (Aspartic acid, Glutamic acid).
  2.Focusing on hydrophobicity/hydrophilicity: While the overall hydrophobicity/hydrophilicity of a protein is important, the charge of amino acids is crucial for understanding histone-DNA interactions.
 **Quick Tips**:
  1.Remember that histones are basic proteins, and basic amino acids carry a positive charge.
  2.Associate lysine and arginine with histone proteins.

D VINOD · Answer

The correct Option is "Lysine and Arginine"

D VINOD · Answer

Glycine and Alanine

D VINOD · Answer

Tryptophan and Phenylalanine

D VINOD · Answer

Cysteine and Methionine

NEET Botany Cell: The Unit of Life MCQs

Select Topic

Question Tags

Question Tags

Question Tags

NEET Subjects

Our Bots

Company