Biology Biotechnology PMDC Conceptual Practice
PMDC Verified Question 2 of 65
Restriction endonucleases are naturally produced by bacteria to:
A
Protect against viral invasion
B
Replicate host plasmids
C
Ligate single-stranded DNA
D
Synthesize bacterial RNA
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Protect against viral invasion
Concept:

Bacterial restriction-modification systems operate as an innate immune defense against foreign genetic material.

Solution:

Bacteria produce restriction endonucleases to cleave invading bacteriophage (viral) DNA at specific sequence sites, thereby preventing viral replication and host lysis.

Why other options are incorrect:

  • Replicate host plasmids: Plasmid replication depends on host cellular DNA polymerases and helicases.


  • Ligate single-stranded DNA: Joining DNA strands is catalyzed by DNA ligase, not restriction endonucleases.


  • Synthesize bacterial RNA: Transcription of bacterial RNA is catalyzed by RNA polymerase enzymes.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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