Question

Episome is a type of
A. Plasmid
B. Gene
C. Membrane
D. Cell wall

Answer 1

Hint: Episome, capable of conferring a selective advantage upon the bacteria in which they occur. Episomes may be attached to the bacterial cell membrane. Episomes include insertion sequences and transposons. An example of an episome is viruses.

Complete answer:
Plasmids are defined as the self-replicating, extrachromosomal segments of double-stranded, circular, naked DNA. Plasmids provide unique phenotypic characters in the structure of the bacteria. They are independent of the main nucleoid. Some of the plasmids contain important genes like fertility factor (f factor), nif genes, resistance factors, and colicinogenic factors. Episome is a type of plasmid. Plasmids which can get associated temporarily with the nucleoid are known as episomes.
Episome is defined as one of a group of extrachromosomal genetic elements. They are called the plasmids, consisting of DNA, that is capable of conferring a selective advantage upon the bacteria in which they occur.

Hence, the correct answer is option (A).

Additional information:
A gene is in DNA or RNA, represented as any sequence of nucleotides that encodes the synthesis of a gene product, either RNA or protein.
A selective barrier that allows some things to pass through it but stops certain things is called a membrane. Such things may include molecules, ions, or other small particles.
A cell wall is a structural layer. It surrounds the cell surface. It is present just outside the cell membrane. It can either be tough, flexible, or sometimes rigid.

Note: An episome is that portion of genetic material that exists independent of the main body of the chromosome, sometimes is able to integrate into the chromosome. Episome is a kind of plasmid. When plasmid gets associated temporarily with nucleoid then it is called Episomes.