The diagram represents a model of DNA replication - HSC - SSCE Biology - Question 10 - 2005 - Paper 1
Question 10
The diagram represents a model of DNA replication. The steps are NOT in the correct order.
1. Two identical DNA strands are formed
2. DNA
3. New nucleotides move in... show full transcript
Worked Solution & Example Answer:The diagram represents a model of DNA replication - HSC - SSCE Biology - Question 10 - 2005 - Paper 1
Step 1
DNA unzips
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Answer
The DNA double helix unwinds and separates into two single strands due to the action of the enzyme helicase. This step exposes the nucleotide sequences of each strand, allowing replication to occur.
Step 2
New nucleotides move in to copy the DNA strand
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Answer
Free nucleotides in the cell nucleus pair with the exposed bases on the unzipped DNA strands. DNA polymerase enzymes facilitate the addition of these nucleotides to the growing new strands, complementary to the original strands.
Step 3
Two identical DNA strands are formed
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Answer
As the new strands elongate, two identical DNA molecules are formed, each comprising one old (template) strand and one new strand, a process known as semi-conservative replication.
Step 4
DNA
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Answer
This step represents the point where the DNA replication process is complete, resulting in two identical DNA molecules ready for cell division.
