OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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What happens to the newly formed DNA strands after replication?

  1. They are immediately degraded

  2. They remain as part of the original double helix

  3. Two identical double strands are produced

  4. They create new mutations in the genome

The correct answer is: Two identical double strands are produced

After DNA replication, the newly formed DNA strands result in two identical double strands. During replication, the double helix unwinds, and each original strand serves as a template for creating a new complementary strand. As a consequence, each of the original strands pairs with its newly synthesized counterpart, creating two double strands that are identical to the original DNA molecule. This process is central to cell division, ensuring that each new cell receives an exact copy of the genetic material. The fidelity of this replication process is crucial for maintaining genetic information across generations of cells.

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