2020 source guide · Biology

NEET 2020 Biology Biotechnology Questions

Use this page to connect the official 2020 paper with current Biology practice. NeetVellum does not claim a chapter appeared in that paper until the official question and final key have been mapped.

Practice 220 verified questions →Check official NTA archive ↗

What to master

recombinant-DNA tools, processes and medical, agricultural and environmental applications.

Original practice preview

These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.

Example 1 · difficulty 2/5

In a simple stirred-tank bioreactor used for large-scale culture of microbes, the primary purpose of the stirrer is to:

A. break down the foam that forms on the surface of the culture
B. maintain a constant temperature inside the vessel
C. mix the contents thoroughly so that oxygen and nutrients remain uniformly available to the cells
D. sterilise the culture medium before inoculation

Example 2 · difficulty 4/5

To introduce a recombinant plasmid into E. coli, the cells are incubated with divalent calcium ions and then given a brief heat shock. This method succeeds because:

A. calcium ions enzymatically digest the bacterial cell wall, creating openings through which plasmid DNA enters
B. divalent cations render the bacterial membrane more permeable, and the subsequent rise in temperature drives the DNA into these transiently competent cells
C. heat shock activates intracellular DNA ligase, which integrates the plasmid into the bacterial chromosome
D. calcium ions neutralise the negative charge of the plasmid DNA, allowing it to slip through the membrane unaided

Example 3 · difficulty 3/5

Which of the following double-stranded DNA sequences qualifies as a palindromic sequence of the type recognised by restriction endonucleases?

A. 5'-CATGAC-3'
B. 5'-GACTTC-3'
C. 5'-TTCATT-3'
D. 5'-CTGCAG-3'

The evidence-first practice loop

1. Verify provenanceOfficial paper and final key before accepting a PYQ label.
2. Attempt closed-bookExpose the concept or execution gap before rereading.
3. Repair and returnClassify the miss and re-practice after a delay.

Canonical chapter practice

Biotechnology: Principles and Processes →Biotechnology and its Applications →

Frequently asked questions

Are these official NEET 2020 Biology Biotechnology PYQs?

No. The previews are original NeetVellum practice questions. A historical item receives a PYQ label only after its official paper and authoritative final answer key are attached. Use the official archive for the source paper.

How should I use the NEET 2020 paper?

Solve the official paper under its original timing, verify against the final key, classify every miss, and then use the linked current-syllabus practice bank to repair the exposed concept.