A positive control for a PCR (Polymerase Chain Reaction) is a reaction using a single template and pair of primers amplifying a product of a known size.

Here's why:

1. In a PCR experiment, a positive control is used to ensure that the experiment is working properly. It involves using DNA template and primers that are known to amplify successfully under the given conditions.

2. The product of a known size indicates that the PCR reaction has worked as expected. If the positive control does not produce the expected result, it suggests that there may be a problem with the PCR reagents or the PCR machine.

3. The other options listed are not examples of positive controls. They are examples of negative controls (no primers, no DNA polymerase, no dNTPS) or a complex sample (multiple unknown bacterial DNA fragments), which are used for different purposes in a PCR experiment.

Question

A positive control for a PCR (Polymerase Chain Reaction) is a reaction using a single template and pair of primers amplifying a product of a known size.

Here's why:

1. In a PCR experiment, a positive control is used to ensure that the experiment is working properly. It involves using DNA template and primers that are known to amplify successfully under the given conditions.

2. The product of a known size indicates that the PCR reaction has worked as expected. If the positive control does not produce the expected result, it suggests that there may be a problem with the PCR reagents or the PCR machine.

3. The other options listed are not examples of positive controls. They are examples of negative controls (no primers, no DNA polymerase, no dNTPS) or a complex sample (multiple unknown bacterial DNA fragments), which are used for different purposes in a PCR experiment.

Knowee AI · Accepted Answer

A positive control for a PCR (Polymerase Chain Reaction) is a reaction using a single template and pair of primers amplifying a product of a known size.

Here's why:

1. In a PCR experiment, a positive control is used to ensure that the experiment is working properly. It involves using DNA template and primers that are known to amplify successfully under the given conditions.

2. The product of a known size indicates that the PCR reaction has worked as expected. If the positive control does not produce the expected result, it suggests that there may be a problem with the PCR reagents or the PCR machine.

3. The other options listed are not examples of positive controls. They are examples of negative controls (no primers, no DNA polymerase, no dNTPS) or a complex sample (multiple unknown bacterial DNA fragments), which are used for different purposes in a PCR experiment.

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