Biology flashcards

Created by: Emsdavies
Created on: 30-03-17 11:47

What does DNA replicate by?

Semi-conservative replication -> because half of the strands in each new DNA molecule are from the original DNA molecule.

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How is it easy for DNA to copy itself?

DNA molecules have base pair structure.

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What is the 1st step of DNA replication?

The enzyme ( DNA helicase) breaks the hydrogen bonds between bases on the 2 polynucleotide DNA strands --> this makes the helix unwind creating 2 single form strands.

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What is the 2nd step of DNA replication?

Each original single strand acts as a template for a new strand-> complementary base pairing means free floating DNA nucleotides are attracted to their complementary exposed bases on each original template strand.

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What is the 3rd step of DNA replication?

Condensation reactions join the nucleotides of the new strands together. Catalysed by the enzyme POLYMERASE-->Hydrogen bonds form between the bases on the original and new strands.

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What does each new DNA molecule contain?

One strand from the original DNA molecule and one new strand.

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Other cards in this set

Card 2

Front

How is it easy for DNA to copy itself?

Back

DNA molecules have base pair structure.

Card 3

Front

What is the 1st step of DNA replication?

Back

Card 4

Front

What is the 2nd step of DNA replication?

Back

Card 5

Front

What is the 3rd step of DNA replication?

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