(d) DNA strcuture

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5 Terms

1
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What is dna made of

2 strands of polynucleotide that are anti parallel

Each strand is made of alternating deoxyribose sugar + phosphate groups bonded together to make sugar phosphate backbone

2
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What can the strands be called

5” 3”

Or 3” 5” depends on what carbon is bonded to the phosphate group and which way

3
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What are the 2 strands held by

Hydrogen bonds between nitrogenous bases

4
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How does complementary based pairing happen

The hydrogen bonds alawyas occur between same pairs of bases

ADENINE AND THYMINE = 2 HYDROGEN BONDS

GUANINE AND CYTOSINE = 3 HYDROGEN BONDS

5
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What actually forms the DNA

Twisting of DNA to helix shape