Polynucleotides and DNA 0.0 / 5 ? BiologyPolynucleotides and DNAA2/A-levelOCR Created by: Esme.BCreated on: 04-11-17 13:27 What forms when lots of nucleotides join together? Polynucleotides 1 of 11 What forms a 'phosphodiester bond'? nucleotide joining up between phosphate group + one nucleotide + sugar of another. 2 of 11 What does a 'phosphodiester bond' consist of? phosphate group + two ester bonds 3 of 11 Define 'sugar- phosphate backbone' chain of sugars + phosphates 4 of 11 what bonds need to be broken for polynucleotides to be broken down into nucleotides? Phosphodiester bonds 5 of 11 What forms a DNA double-Helix? Two anti-parallel (opposite direction) polynucleotide strands joined/ twisted together 6 of 11 How are two DNA polynucleotide strands joined together? By hydrogen bonding between the bases. 7 of 11 Define 'complementary base pairing' Each base can only join with one particular partner. 8 of 11 How does the 'Complementary base pairing' work? Purine= Pyrimidine. A=T (Two hydrogen bonds present) C=G (Three hydrogen bonds present) 9 of 11 Define 'Semi-conservative replication' One strand from original DNA + one new strand of DNA 10 of 11 Define 'Mutation' Change to DNA base sequence, alter sequence of amino acids in a protein= abnormal protein to be produced. 11 of 11
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