Questions-3 NAN

    Cards (15)

    • What doe DNA stand for?
      Deoxyribonucleic acid
    • What does RNA stand for?

      Ribonucleic acid.
    • What are the monomers for DNA and RNA?
      nucleotides.
    • What are the three general components for a nucleotide?
      a phosphate , pentose sugar and nitrogen containing base
    • What are the four organic bases in DNA?
      Adenine, Thymine, Guanine, Cytosine
    • what type of bond is formed by two adjacent nucleotides?
      phosphodiester bond.
    • what shape is a DNA molecule?
      double-stranded double helix.
    • which bonds keep DNA strands together?
      hydrogen bonds
    • describe the structure of RNA?
      relatively short single stranded polynucleotide chain.
    • what is the first stage in DNA replication?
      unwinding the double helix using DNA helicase.
    • what is the role of DNA helicase?
      breaks hydrogen bonds between complementary bases.
    • what does DNA polymerase do in replication?
      joins adjacent nucleotides to form phosphate backbone.
    • how many hydrogen bonds form between thymine and adenine?
      2 hydrogen bonds
    • how many bonds form between guanine and cytosine?
      3 hydrogen bonds
    • how do you obtain DNA fragments using electrophoresis
      -use of restrictions enzymes
      -use of buffer
      -place DNA in sample wells at negative cathode
      -shorter fragments move towards anode faster than larger fragments
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