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5 October, 18:29

Which of the following places the steps in the PCR procedure in the correct order?

1) Incubate at 94°C to denature DNA strands;

2) Incubate at 72°C for DNA synthesis;

3) Incubate at 60°C for primer hybridization.

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  1. 5 October, 20:32
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    Polymerase chain reaction (PCR) test is used to duplicate traces of DNA from any living form, for identification purposes. The correct sequence is 1, 3, 2; based on the options given.

    Explanation:

    The steps to be followed for the PCR procedure are:

    Denaturation

    Option 1. Involves incubation at 94°C to denature DNA strands into single strands by breaking of weak hydrogen links

    Annealing

    Option 3. Temperature is lowered to 60°C to allow primers joining their similar DNA sequences.

    Elongation

    Option 2. Incubate at 72°C to promote the extension of the DNA strands, actually extending them.
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