Question

The five major type of histones are:

• A. H1, H2, H3, H4 and H5
• B. H1, H2A, H2B, H3 and H4
• C. H1A, H1B, H2 and H3
• D. H1, H2, H3, H4A and H4B

Hint:

Remember: Core histones are "H2A, H2B, H3, and H4" (two of each form the octamer), while H1 acts as the outer "linker."

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Histones are basic, positively charged proteins rich in lysine and arginine residues.
They interact electrostatically with the negatively charged phosphate backbone of DNA to package genomic DNA into nucleosomes.

Step 2: Detailed Explanation:
Eukaryotic cells package chromatin using five major classes of histone proteins, divided into core histones and linker histones.
The core histones are H2A, H2B, H3, and H
Two copies of each core histone assemble to form an octamer, around which approximately 147 base pairs of DNA are wound.
The linker histone, H1, binds to the entry and exit sites of the DNA on the nucleosome core to help stabilize higher-order chromatin structures.
While specialized variant histones like H5 exist in certain cell types (such as nucleated avian red blood cells), the universal major classes are H1, H2A, H2B, H3, and H

Step 3: Final Answer:
The five major types of histones responsible for chromatin organization are H1, H2A, H2B, H3, and H