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Host–Vector System — Study Plan

CBSE · Class 12 · Biotechnology

A step-by-step study plan for Host–Vector System, CBSE Class 12 Biotechnology: what to learn first, what to practise and when to revise.

64 questions80 flashcards5 concepts

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A flowchart illustrating the two major steps of recombinant DNA technology: isolation of target gene (insert) and its insertion into a vector to form recombinant DNA (rDNA), followed by introduction i
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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas and key ideas. Focus on: 1. Core idea of host–vector system, 2. Features of a good vector, 3. Plasmids as vectors.

2
Day 3

Practise

Solve the textbook exercises and extra practice questions. There are 64 questions available for this chapter.

3
Day 4

Revise & Test

Revise key points without looking at your notes. Take a practice quiz and mark weak areas for another pass.

4
Day 7

Spaced Revision

Come back to Host–Vector System after a week. Use flashcards for quick recall and try past exam questions on this chapter.

What to Focus On

  • Recombinant DNA technology uses both a host and a vector.
  • The insert is the target DNA; the vector carries it.
  • The host provides replication functions.
  • E. coli is the most extensively used prokaryotic host.
  • E. coli K12 is commonly used in gene cloning.
  • Bacillus subtilis is useful when protein secretion is the goal.
  • Plasmids are circular, ds, extra-chromosomal DNA.
  • Episomes are plasmids that can integrate into the host chromosome.
  • R-plasmids confer antibiotic resistance.

Common Mistakes to Avoid

A vector alone can do the cloning work without a host.

Any DNA molecule can be used as a vector if it can enter a cell.

E. coli is used as a host only because it is common, not because it grows rapidly.

Memory Tips

Core idea of recombinant DNA technology as a host-vector system

E. coli as the most extensively used prokaryotic host

K12 strain of E. coli is commonly used in gene cloning

Bacillus subtilis as an alternative prokaryotic host for secretion

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Frequently Asked Questions

What are the important topics in Host–Vector System for CBSE Class 12 Biotechnology?
Key topics in Host–Vector System include Core idea of host–vector system, Features of a good vector, Plasmids as vectors, Development of plasmid vectors. Study these first, then practise questions on each for the CBSE Class 12 board exam.
How should I revise Host–Vector System for the CBSE Class 12 board exam?
Learn the core ideas first, then work through the 64 practice questions on Host–Vector System. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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