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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
What can the strands be called
5” 3”
Or 3” 5” depends on what carbon is bonded to the phosphate group and which way
What are the 2 strands held by
Hydrogen bonds between nitrogenous bases
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
What actually forms the DNA
Twisting of DNA to helix shape