What is one of the primary functions of DNA polymerase in genetic engineering?

• A. To edit genes directly
• B. To synthesize new strands of DNA during replication
• C. To translate RNA into proteins
• D. To hydrolyze DNA molecules

Answer: (B)

One of the primary functions of DNA polymerase is to synthesize new strands of DNA during replication. This enzyme plays a crucial role in the cellular processes of DNA replication by adding nucleotides to the growing DNA strand in a 5' to 3' direction. It ensures that the genetic information is accurately duplicated so that it can be passed on during cell division.

In genetic engineering, DNA polymerase is also pivotal for techniques such as PCR (Polymerase Chain Reaction), where it amplifies specific DNA sequences, allowing for further analysis and manipulation of genetic material. Its ability to create complementary strands based on a template DNA makes it indispensable for cloning, sequencing, and various forms of genetic engineering.

Other choices do not accurately represent the primary functions of DNA polymerase. For example, editing genes directly would rely on other tools and enzymes, such as CRISPR-Cas9, while translating RNA into proteins is the role of ribosomes and transfer RNA (tRNA), not DNA polymerase. Additionally, hydrolyzing DNA molecules typically involves enzymes like restriction endonucleases rather than DNA polymerase, which operates in the synthesis rather than breakdown of DNA.