MCQ
Geometric representation of age structure is a characteristic of.
- ABiotic community.
- BPopulation.
- CLandscap.
- DEcosystem.
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$T$-cells are lymphocytes which produce the cellular immunity. These are developed from
Assertion $(A):$
Polymerase chain reaction is used in DNA amplification
Reason $(R):$
The ampicillin resistant gene is used as a selectable marker to check transformation
In the light of the above statements, choose the correct answer from the options given below :