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What is the direction of DNA strand synthesis during replication?

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Question: What is the direction of DNA strand synthesis during replication?

Options:

  1. 5\' to 3\'
  2. 3\' to 5\'
  3. Both directions
  4. Random direction

Correct Answer: 5\' to 3\'

Solution: 

DNA strands are synthesized in the 5\' to 3\' direction.

What is the direction of DNA strand synthesis during replication?

Practice Questions

Q1
What is the direction of DNA strand synthesis during replication?
  1. 5' to 3'
  2. 3' to 5'
  3. Both directions
  4. Random direction

Questions & Step-by-Step Solutions

What is the direction of DNA strand synthesis during replication?
  • Step 1: Understand that DNA is made up of two strands that run in opposite directions.
  • Step 2: Each strand has a direction indicated by numbers: 5' (five prime) and 3' (three prime).
  • Step 3: During DNA replication, new strands are created by adding nucleotides.
  • Step 4: Nucleotides can only be added to the 3' end of the growing DNA strand.
  • Step 5: Therefore, as nucleotides are added, the new strand grows in the 5' to 3' direction.
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