Question

Match List-I with List-II:

List-I	List-II
A. Histones	III. Positively charged basic proteins
B. Nucleosome	IV. DNA wrapped around histone octamer
C. Euchromatin	I. Loosely packed chromatin
D. Heterochromatin	II. Densely packed Chromatin

Choose the correct answer from the options given below:

• A. A-IV, B-III, C-II, D-I
• B. A-III, B-I, C-IV, D-II
• C. A-II, B-III, C-IV, D-I
• D. A-III, B-IV, C-I, D-II

Answer 1

The Correct Option is D

In this question, we need to match items in List-I with their appropriate descriptions in List-II. Let's analyze each match step-by-step:

1. A. Histones are proteins that play a critical role in the structural formation of chromatin. They are positively charged basic proteins (Option III), which helps them to associate with the negatively charged DNA. This makes Option III the correct match for A.
2. B. Nucleosome is the fundamental unit of chromatin, consisting of a segment of DNA wound in sequence around eight histone protein cores. This configuration forms when DNA is wrapped around a histone octamer (Option IV). Therefore, Option IV is the correct match for B.
3. C. Euchromatin refers to a state of chromatin that is partially condensed and generally transcriptionally active, allowing DNA to be accessed for transcription. It is described as loosely packed chromatin (Option I). Hence, Option I is the right match for C.
4. D. Heterochromatin is a tightly packed form of DNA, which is usually transcriptionally inactive. It is densely packed chromatin (Option II), making Option II the accurate match for D.

Based on the analysis above, the correct answer is: 

A	III
B	IV
C	I
D	II

Thus, the correct option from the given choices is:

A-III, B-IV, C-I, D-II