CUET · BIOLOGY · PYQ PAPER 2023

Arrange the following steps of gel electrophoresis in correct sequence
A. Staining with ethidium bromide.
B. Loading of DNA fragments on agarose gel.
C. Separation of DNA by moving them, towards anode under electric field.
D. Visualising by exposure to UV radiations.
Choose the correct answer from the options given below:

A B-C-D-A
B A-B-D-C
C B-C-A-D
D B-A-C-D

Verified Solution

Answer & Solution

Correct Answer

(C) B-C-A-D

Step-by-step Solution

Detailed explanation

B-C-A-D

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.

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