CUET · BIOLOGY · PYQ PAPER 2025

Cloning of alien DNA by the host involves -

A Attaching at the specific sequence site (ori) in the host
B Complementing recombinant with non recombinant fragments
C Ligating at multiple recognition sites
D Insertion activation technique

Verified Solution

Answer & Solution

Correct Answer

(A) Attaching at the specific sequence site (ori) in the host

Step-by-step Solution

Detailed explanation

Attaching at the specific sequence site (ori) in the host

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match List I with List II

List I (Technique/term)	List II (Features)
(A) Amniocentesis	(I) Ligation of fallopian tube
(B) Maternal mortality rate	(II) Ligation of vas deferens
(C) Vasectomy	(III) Death rate
(D) Tubectomy	(IV) Testing of sex

Choose the correct options:

CUET 2025 Easy

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List-l (Metal)	List-II (Properties)
(A) \(Sc ^{3+}\)	(I) \(3 d^3\)
(B) \(Cr ^{3+}\)	(II) Colorless
(C) \(Cu ^{2+}\)	(III) \(3 d^8\)
(D) \(Ni ^{2+}\)	(IV) \(3 d^9\)