- A Determining the order of nucleotide bases in DNA
- B Detection of antibodies or antigens (e.g., HIV test)
- C Culturing bacterial colonies on agar plates
- D Separating DNA fragments by molecular size
Correct answer: B. Detection of antibodies or antigens (e.g., HIV test)
Explanation: ELISA (Enzyme-Linked Immunosorbent Assay) detects specific antigens or antibodies. Used for HIV, hepatitis, pregnancy tests.
Concept context
Recombinant DNA, GMOs, PCR, CRISPR, and biotechnology applications. Growing importance in NEET.
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