DNAAnd its Replication    Not in text
DNA stands for deoxyribonucleicacid.Double helix model proposed byJames Watson and Francis Crick in1953.
Shape is double helix, like atwisted ladder.DNA is composed of subunitscalled nucleotides.
A nucleotide includes:   1 molecule of the sugardeoxyribose   1 phosphate group, and   1 of four nitrogen bases           ...
The four nitrogen bases are:   Adenine – A   Thymine – T   Guanine – G   Cytosine - C
Thymine and cytosine are singleringed bases called pyrimidines.Guanine and adenine are doubleringed bases called purines.
The rungs of the ladder are heldtogether by the weak hydrogenbond formed between apyrimidine and a purine base.This bond i...
BASE PAIRING RULE      Adenine - Thymine      Guanine - CytosineThese nitrogen bases always bond            together.
DNA ReplicationProcess of copying DNA in thenucleus.Following DNA replication, twoidentical DNA molecules have beenproduce...
This process is“semiconservative” in that eachstrand of the original double-stranded DNA molecule serves astemplate for th...
A and P Mod. #1 DNA and DNA replicatoin
A and P Mod. #1 DNA and DNA replicatoin
A and P Mod. #1 DNA and DNA replicatoin
A and P Mod. #1 DNA and DNA replicatoin
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A and P Mod. #1 DNA and DNA replicatoin

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A and P Mod. #1 DNA and DNA replicatoin

  1. 1. DNAAnd its Replication Not in text
  2. 2. DNA stands for deoxyribonucleicacid.Double helix model proposed byJames Watson and Francis Crick in1953.
  3. 3. Shape is double helix, like atwisted ladder.DNA is composed of subunitscalled nucleotides.
  4. 4. A nucleotide includes: 1 molecule of the sugardeoxyribose 1 phosphate group, and 1 of four nitrogen bases deoxyribose
  5. 5. The four nitrogen bases are: Adenine – A Thymine – T Guanine – G Cytosine - C
  6. 6. Thymine and cytosine are singleringed bases called pyrimidines.Guanine and adenine are doubleringed bases called purines.
  7. 7. The rungs of the ladder are heldtogether by the weak hydrogenbond formed between apyrimidine and a purine base.This bond is easily broken andreformed for DNA replication andRNA synthesis.
  8. 8. BASE PAIRING RULE Adenine - Thymine Guanine - CytosineThese nitrogen bases always bond together.
  9. 9. DNA ReplicationProcess of copying DNA in thenucleus.Following DNA replication, twoidentical DNA molecules have beenproduced from a single double-stranded DNA molecule.
  10. 10. This process is“semiconservative” in that eachstrand of the original double-stranded DNA molecule serves astemplate for the reproduction ofthe complementary strand.

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