Question

Assertion (A): Plasmids are autonomously replicating circular extra-chromosomal DNA.

Reason (R): Plasmids are usually present in Eukaryotic cells.

Options

• Both (A) and (R) are true and (R) is the correct explanation of (A).

• Both (A) and (R) are true and (R) is not the correct explanation of (A).

• (A) is true, but (R) is false.

• (A) is false, but (R) is true.

Answer 1

(A) is true, but (R) is false.

Explanation:

Assertion (A) is the correct answer. Plasmids are made up of DNA units that copy themselves and are not connected to chromosomal DNA. They can copy themselves on their own inside a host cell. However, the reason (R) is wrong. It is not common for mammalian cells to have plasmids. Most of the time, they are found in prokaryotic cells, like bacteria.