DNA + RNA 3.0 / 5 based on 1 rating ? Human BiologyDNA, genetics and evolutionASAQA Created by: Harriet hopeCreated on: 18-03-13 19:19 What does DNA stand for ? Deoxyribose Nucleic Acid 1 of 25 What is the name for a Polymer made up of repeated units? nucleotides 2 of 25 What are Nucleotides made up of ? five carbon sugar, a phosphate group, netrogenous base 3 of 25 what are the names of the four netrogenous bases? adenine, guanine, cytosine and thymine 4 of 25 How does a long polynucleotide strand form? the phosphate and sugars from adjacent nucleotides join together by condensation reactions 5 of 25 DNA is made up of How many strands, and what are the strands called? 2 polynucleotide strands 6 of 25 what bonds bond netrogenous bases together ? hydrogen 7 of 25 What does RNA stand for? Ribonucleic Acid 8 of 25 what nucleotides does RNA contain? Adenine, guanine, cytosine and URACIL 9 of 25 RNA is a what type of strand ? SINGLE polynucleotide strand 10 of 25 Name one difference between RNA and DNA DNA- double nucleotide chain, RNA-single nucleotide chain 11 of 25 Which Nucleotide pairs with Uracil in RNA adenine 12 of 25 What is the five carbon sugar of DNA and RNA DNA= deoxyribose, RNA=ribose 13 of 25 Is DNA usually much longer or shorter than RNA? LONGER 14 of 25 What is a gene? a section of DNA that codes for one protein, and carries coded info about a characteristic 15 of 25 How many pairs of chromosomes does a human body cell have ? 23 pairs 16 of 25 What are homologous chromosomes ? A pair of chromosomes which have the same genes but different alleles 17 of 25 Where do genes occur? at the same relative locus on homologous chromosomes- these paired chromosomes are not completely identical, but they carry the same genes 18 of 25 DNA replicates by what method? semi-conservative method 19 of 25 what happens in this model? one strand of the old molecule is kept intact, and the other strand is newly made 20 of 25 What is the first stage of the semi- conservative model? DNA molecule unzips, the hydrogen bonds between bases break 21 of 25 what is the second stage of the semi-conservative model? new nucleotides align alongside their complementary bases 22 of 25 what is the third stage of the semi-conservative model? and enzyme called POLYMERASE joins these new nucleotides 23 of 25 What is the fourth stage of the semi-conservative model? each new strand is complementary to the old strand and each of the new molecules formed is identical 24 of 25 What is the fifth and last stage of the semi-conservative model? DNA replication occurs during interphase, before all cells divide by mitosis 25 of 25
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