Question

Find out the correct statements among the following: A. DNA is (-Ve) charged, Histone proteins are (+Ve) charged.
B. DNA is (+Ve) charged, Histone proteins are (-Ve) charged.
C. Euchromatin is transcriptionally active.
D. Euchromatin and heterochromatin both are transcriptionally inactive.

• A. A, C
• B. B, C
• C. A, D
• D. B, D

Hint:

Euchromatin is associated with active gene expression, while heterochromatin is more compact and transcriptionally inactive.

Answer 1

The Correct Option is A

Let's evaluate the given statements:
- A) DNA is (-Ve) charged, Histone proteins are (+Ve) charged: This is true. DNA is negatively charged due to the phosphate backbone, while histone proteins are positively charged due to the presence of basic amino acids (lysine and arginine). This positive charge on histones helps them interact with the negatively charged DNA, facilitating chromatin packaging.
- B) DNA is (+Ve) charged, Histone proteins are (-Ve) charged: This is false. As mentioned earlier, DNA is negatively charged, and histone proteins are positively charged, not the other way around.
- C) Euchromatin is transcriptionally active: This is true. Euchromatin is the less condensed form of chromatin and is transcriptionally active, allowing genes to be accessed for transcription.
- D) Euchromatin and heterochromatin both are transcriptionally inactive: This is false. While heterochromatin is transcriptionally inactive and highly condensed, euchromatin is transcriptionally active and loosely packed, allowing gene expression. Thus, the correct answer is A and C.