Question

Choose the correct answers from the alternatives given :
When DNA replication begins

• A. The two DNA strands unwind from each other
• B. Old strands move to find new strands
• C. Two DNA molecules bond
• D. The two DNA strands condense for base transfers

Answer 1

The correct option is A The two DNA strands unwind from each other

During DNA replication, helicase enzymes help in the unwinding of the DNA strands. It helps in the breaking of the hydrogen bonds and separating the two strands so that they are available for the synthesis of new DNA strands. As the replication moves further, the previous hydrogen bonds reform and the DNA structure is restored.

So, the correct option is 'The two DNA strands unwind from each other'.