In Recombinant \(DNA\) technology antibiotics are used

A As selectable markers
B To keep medium bacteria-free
C To detect alien DNA
D To impart disease-resistance to the host plant

Verified Solution

Answer & Solution

Correct Answer

(B) To keep medium bacteria-free

Step-by-step Solution

Detailed explanation

The correct answer is option (2) because antibiotics are used in RDT to keep medium or culture bacteria-free. Selectable marker helps in identifying and eliminating non-transformants and selectively permitting the growth of the transformants. They undergo insertional inactivation upon addition of alien DNA in their ORF.

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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From NEET

For the following logic circuit, the truth table is:

NEET 2023 Medium

Match List \(- I\) with List \(- II.\)

List \(- I\)	List \(- II\)
\((a)\) Allen's Rule	\((i)\) Kangaroo rat
\((b)\) Physiological adaptation	\((ii)\) Desert lizard
\((c)\) Behavioural adaptation	\((iii)\) Marine fish at depth
\((d)\) Biochemical adaptation	\((iv)\) Polar seal

Choose the correct answer from the options given below. \((a) -(b)- (c)- (d)\)

NEET 2021 Medium

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List \(I\)	List \(II\)
\(A\). Taenia	\(I\). Nephridia
\(B\). Paramoecium	\(II\). Contractile vacuole
\(C\). Periplaneta	\(III\). Flame cells
\(D\). Pheretima	\(IV\). Urecose gland