DNA

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DNA

  1. 1. DNA (deoxyribonucleic acid)
  2. 2. Primary Roles of DNA  Store Information  Copy Information – A cell must make a complete copy of its DNA before the cell divides  Transmit Information – DNA molecules must be carefully sorted and passed along when cells divide
  3. 3. Vocabulary  Nucleic acid – molecule that is essential for life – Long molecule found in a cell’s nucleus – Made of smaller subunits – Examples are DNA and RNA
  4. 4. Vocabulary (cont.)  Nucleotides –Have 3 parts  A 5-carbon sugar (deoxyribose or ribose)  A phosphate group  A base that contains Nitrogen –Adenine, Guanine, Cytosine, Thymine
  5. 5. Structure of DNA  Nucleic acid made of nucleotides  Double helix model – Looks like a twisted ladder  Base pairing – bonds in DNA can form only between adenine and thymine or between guanine and cytosine
  6. 6. Structure of DNA  Nucleic acid made of nucleotides  Double helix model – Looks like a twisted ladder  Base pairing – bonds in DNA can form only between adenine and thymine or between guanine and cytosine

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