Question 1

Polymerase Chain Reaction (PCR) is the technique used to make multiple copies of a short DNA segment.

PCR is specifically designed to amplify DNA segments, allowing a scientist to create numerous copies of a particular DNA sequence quickly and efficiently.

A) Restriction Digest

Restriction digest involves cutting DNA into smaller fragments using restriction enzymes. While this technique is essential for manipulating DNA, it does not amplify or create multiple copies of a DNA segment, making it unsuitable for this purpose.

B) Polymerase Chain Reaction (PCR)

PCR is the correct answer as it is a widely used method for amplifying specific DNA segments. It involves repeated cycles of denaturation, annealing, and extension, resulting in the exponential increase of the target DNA sequence.

C) Gel Electrophoresis

Gel electrophoresis is a technique used to separate DNA fragments based on their size. While it is valuable for analyzing DNA, it does not enable the replication or amplification of DNA segments, thus it does not fulfill the requirement of making multiple copies.

D) Recombinant DNA Technology

Recombinant DNA technology involves combining DNA from different sources, which can be used to study genes and produce proteins. However, it does not specifically focus on amplifying a short DNA segment, rendering it ineffective for the purpose of creating multiple copies of that segment.

Conclusion

Polymerase Chain Reaction (PCR) is the definitive method for amplifying small DNA segments, making it the ideal choice in this scenario. Other options, while important in molecular biology, either manipulate or analyze DNA without providing the amplification necessary for producing multiple copies.