NEET UG 2020 · Zoology · Question 21
NEET 2020 Zoology, question 21
Question 21 of the NEET 2020 paper (code E1) is a Zoology question from Biotechnology: Principles and Processes. Its idea, EcoRI Recognition Sequence, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 1.
Updated 2026-10-08
Q21 · Zoology
The specific palindromic sequence which is recognized by EcoRI is :
- 15' - GAATTC - 3' 3' - CTTAAG - 5'Official answer
- 25' - GGAACC - 3' 3' - CCTTGG - 5'
- 35' - CTTAAG - 3' 3' - GAATTC - 5'
- 45' - GGATCC - 3' 3' - CCTAGG - 5'
Official answer: option 1 · NTA final answer key
Same idea
The only question on EcoRI Recognition Sequence
No other NEET paper from 2017–2026 tested this exact idea.
EcoRI Recognition Sequence: every question and how it was framed
The chapter
Biotechnology: Principles and Processes in ten years of NEET
46 questions from 2017–2026, asked in 10 of 10 papers, about 4.4 a paper. Restriction Enzymes alone had 22.