Which strand of DNA is synthesized continuously during DNA replication?

• A. Lagging Strand
• B. Leading Strand
• C. Okazaki Fragment
• D. Template Strand

Answer: (B)

During DNA replication, the leading strand is synthesized continuously in the 5' to 3' direction towards the replication fork. This continuous synthesis is possible because DNA polymerase adds nucleotides in that direction as the double helix unwinds. The leading strand serves as a template for the addition of complementary nucleotides, allowing for a straightforward and uninterrupted synthesis process.

In contrast, the lagging strand is synthesized discontinuously in short segments known as Okazaki fragments, which are later joined together. The template strand refers to the original strand of DNA that guides the synthesis of the new strands; however, this term is broader and does not specify synthesis continuity. Therefore, the leading strand is specifically the continuously synthesized strand during replication, making it the correct answer.