What is a vector in genetic engineering?

• A. A type of protein used in cellular functions
• B. A vehicle used to transfer genetic material into a host cell
• C. A new form of genetic material
• D. An enzyme for cutting DNA

Answer: (B)

In the context of genetic engineering, a vector is defined as a vehicle that is used to transfer genetic material into a host cell. Vectors play a crucial role in creating recombinant DNA, enabling scientists to insert specific genes into organisms to study their function, produce proteins, or create genetically modified organisms. Common types of vectors include plasmids, viruses, and artificial chromosomes, which all provide the necessary tools for the delivery and maintenance of foreign DNA within a host.

This mechanism is fundamental in biotechnology for applications such as gene therapy, producing genetically engineered crops, and creating models for disease studies. Through vectors, the safe and efficient introduction of desired genes into target cells is achieved, allowing for controlled expression of the inserted genetic material.