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Arginine and lysine carries …..(1)….. ch...

Arginine and lysine carries …..(1)….. charge in their side chains. Histones are organised to form a unit of eight molecules called …..(2)….. The negatively charged DNA is wrapped around the positively charged histone octamer to form a structure called .....(3).....
Here A, B and C refers to

A

A-positive, B-histone octamer, C-nucleosome

B

A-negative, B-nucleosome, C-histone octamer

C

A-neutral, B-nucleosome, C-histone octamer

D

A-neutral, B-octamer, C-histone tetramer

Text Solution

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The correct Answer is:
To solve the question, we need to fill in the blanks with the correct terms related to the properties of amino acids and the structure of histones and DNA. Let's break it down step by step. ### Step-by-Step Solution: 1. **Identify the Charge of Arginine and Lysine:** - Arginine and lysine are both amino acids that are known to carry a **positive charge** in their side chains. This is due to the presence of amino groups in their structures which can accept protons (H+ ions) at physiological pH. **Answer for (1):** Positive 2. **Determine the Unit of Histones:** - Histones are organized into a structure that consists of eight histone molecules. This unit is referred to as an **octamer**. The term "octamer" indicates that there are eight subunits (in this case, histone proteins) that come together to form a complex. **Answer for (2):** Octamer 3. **Identify the Structure Formed by DNA and Histones:** - The negatively charged DNA wraps around the positively charged histone octamer, forming a structure known as a **nucleosome**. This is the fundamental unit of chromatin, which helps in packaging DNA into a compact form. **Answer for (3):** Nucleosome ### Final Answers: - (1) Positive - (2) Octamer - (3) Nucleosome
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