Paper I — 2024 December (Supplementary) (2019 Scheme) — Qxiv

Paper I

2024 December (Supplementary) (2019 Scheme) · 100 marks · 180 min

Question

An example of extrachromosomal element is

• a) rRNA
• b) DNA
• c) Plasmid
• d) mRNA

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Answer

- [x] c) Plasmid

A plasmid is a small, extrachromosomal, double-stranded, circular DNA molecule capable of independent (autonomous) replication within a bacterial cell, distinct from the bacterial chromosome — the classic example of an extrachromosomal genetic element, often carrying antibiotic-resistance or virulence genes. rRNA, DNA (as a general term, referring to the chromosome), and mRNA are not, by themselves, extrachromosomal elements — genomic DNA constitutes the chromosome itself, and rRNA/mRNA are transcription products, not independently replicating genetic elements.

Related Concepts

1. 1Bacterial Genetics

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