Biology SL chapter 3.3+4 (DNA structure + replication)

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Structure of DNA
Phosphate group attached to a 5C sugar (deoxyribose) which also has a nitrogenous base attached.
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Four bases of DNA
Guanine, adenine, cytosine, thymine. A and T are linked with two hydrogen bonds, G and C are linked with three hydrogen bonds
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Role of helicase in DNA replication
Unwinds DNA and separates the two polynucelotide strands by breaking hydrogen bonds. The two separated strands act as templates for synthesis of new DNA.
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Role of DNA polymerase in DNA replication
Synthesises new strands from the two parental template strands. free nucleotides are aligned opposite their complementary base partner and bonded b DNA polymerase.
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Significance of complementary base pairs
Each of the nitrogenous bases can only pair with it's complementary partner. This means that when DNA is replicated, the new strands will be identical to the old ones.
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Other cards in this set

Card 2

Front

Four bases of DNA

Back

Guanine, adenine, cytosine, thymine. A and T are linked with two hydrogen bonds, G and C are linked with three hydrogen bonds

Card 3

Front

Role of helicase in DNA replication

Back

Preview of the front of card 3

Card 4

Front

Role of DNA polymerase in DNA replication

Back

Preview of the front of card 4

Card 5

Front

Significance of complementary base pairs

Back

Preview of the front of card 5

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