higher human unit 1.2 5.0 / 5 based on 3 ratings ? Human BiologyDNA structure and replication Scottish HighersSQA Created by: jennylock2Created on: 29-09-21 15:55 Describe the shape of DNA Double Helix 1 of 22 what are the building blocks which make up a strand af DNA? Nucleotides 2 of 22 what are the three parts of a DNA nucleotide? phosphate, deoxyribose sugar and base 3 of 22 what are the four bases called in DNA? Adenine, cytosine, guanine and thymine 4 of 22 In DNA which base is complementary to thymine adenine 5 of 22 where is DNA stored? nucleus 6 of 22 which molecule is DNA tightly soiled around to form chromosomes? protein 7 of 22 How many chromosomes are in a human body cell? 46 8 of 22 What bonds form to create the sugar -phosphate backbone? strong chemical bonds 9 of 22 how are the complimentary bases between the strands of DNA held together? hydrogen bonds 10 of 22 what molecule is at the 5' end of DNA phosphate 11 of 22 what molecule is at the 3' end of a DNA strand? deoxyribose sugar 12 of 22 What is meant by DNA strands are anti parallel? one strand runs 5' to 3' and the other runs 3' to 5' 13 of 22 what is stage 1 of replication? the DNA strands unwind and unzip when hydrogen bonds are broken 14 of 22 which enzyme is required to add the free DNA nucleotides? DNA polymerase 15 of 22 what needs to bind to the DNA template before nucleotides can be added? primers 16 of 22 What is the role of DNA polymerase? it adds nucleotides to the 3' end of the DNA strand 17 of 22 on which strand is DNA replication carried out continuously? leading strand 18 of 22 how is replication different on the leading and lagging strands? the leading strand is continuous and the lagging strand nucleotides are joined in fragments 19 of 22 which enzyme joins the fragments together on the lagging strand? ligase 20 of 22 when does DNA replication take place? before cell division 21 of 22 what substances need to be present for DNA replication to happen? ATP, Enzymes, primer, DNA template, DNA nucleotides 22 of 22
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