2.3.2- Polynucleotides and DNA

Polynucleotide structure:

• nucleotides join together to make polynucleotides
• the nucleotides join at the phosphte group of one nucleotide and the sugar of another
• they form in a condensation reaction
• this forms a phosphodiester bond.
• this chain of sugars and phosphates is a sugar-phosphate backbone
• they can be broken down into nucleotides in a hydrolysis reaction

DNA structure:

• 2 polynucleotide strands joined to form a double-helix shape
• the two strands join by hydrogen bonds between the bases
• a A and T join together by 2 hydrogen bonds 
• a C and a G join together by 3 hydrogen…