Question

An organism exclusively with 70S type of ribosome contains one of the following:

• A. DNA enclosed within the nuclear membrane
• B. Circular naked DNA
• C. Double-stranded DNA with protein coat
• D. Single-stranded DNA with a protein coat

Answer 1

The correct option is B

Circular naked DNA

The correct option is B:

Explanation of the correct option:

Ribosomes are the site for protein synthesis.

Types of ribosomes:

1. 70S ribosomes: Ribosomes of prokaryotes,
2. 80S ribosomes: Eukaryotic ribosomes.

In mitochondria and chloroplast, ribosomes are the 70S, an organism exclusively with 70S type of ribosome contains circular naked DNA.

Explanation of the incorrect option:

Option A:

DNA enclosed within the nuclear membrane is a characteristic feature of eukaryotes.

Option C and Option D:

Double-stranded DNA with a protein coat(histones) and single-stranded DNA with a protein coat are features of eukaryotes.

Final answer: An organism exclusively with 70S type of ribosome contains circular naked DNA.