Host–Vector System
CBSE · Class 12 · Biotechnology
Most important questions from Host–Vector System for CBSE Class 12 Biotechnology board exam 2026. MCQs, short answer, and long answer questions with marks.
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What is an episome?
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A plasmid that can integrate into the host chromosome
Episomes are plasmids that can integrate into the host chromosome.
Which plasmid category provides drug resistance by encoding enzymes that deactivate antibiotics?
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R-plasmid
R-plasmids provide drug resistance, such as resistance to ampicillin and tetracycline.
Which plasmid category produces colicins that kill other bacteria?
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Col plasmid
Col plasmids produce toxins called colicins, which kill other bacteria.
Which plasmid category contains transfer genes for pilus formation and plasmid transfer?
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F-plasmid
F-plasmids contain transfer genes that help form a pilus for transfer to other cells.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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