CHAPTER 9 & 10 NOTES DNA STRUCTURE &   FUNCTION
What is DNA? <ul><li>Nucleic   acid  – a compound composed of a 5-carbon sugar, a nitrogen base, and a phosphate. </li></u...
 
Who discovered DNA? <ul><li>DNA was discovered in the late 1940’s, but the structure was not discovered until  1953 .  Two...
What does Watson and Crick’s DNA model look like? <ul><li>The shape looks like a twisted ladder –  double   helix . </li><...
DNA double helix
What are the nitrogen bases? <ul><li>There are 4 different nitrogen bases in DNA: </li></ul><ul><li>1. guanine - G </li></...
How do the bases bond? <ul><li>The nitrogen bases always bond in the same way: </li></ul><ul><li>adenine  to  thymine A - ...
Base Pairing
 
How are these parts put together? <ul><li>DNA is built up in small units. Each unit is made up of a  sugar , a  phosphate ...
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Chapter 9 & 10 notes

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Chapter 9 & 10 notes

  1. 1. CHAPTER 9 & 10 NOTES DNA STRUCTURE & FUNCTION
  2. 2. What is DNA? <ul><li>Nucleic acid – a compound composed of a 5-carbon sugar, a nitrogen base, and a phosphate. </li></ul><ul><ul><li>Deoxyribonucleic acid – DNA – controls the cells activities, carries genetic information. It is found in the nucleus of the cell. </li></ul></ul>
  3. 4. Who discovered DNA? <ul><li>DNA was discovered in the late 1940’s, but the structure was not discovered until 1953 . Two scientists named James Watson and Francis Crick came up with a model of the structure of DNA. </li></ul>
  4. 5. What does Watson and Crick’s DNA model look like? <ul><li>The shape looks like a twisted ladder – double helix . </li></ul><ul><li>Each side is made up of alternating sugar and phosphate molecules. The sugar in DNA is called deoxyribose. </li></ul><ul><li>Attached to each sugar is a nitrogen base . </li></ul><ul><li>To make the ladder complete, each base is joined by a weak hydrogen bond to a base on the other side. </li></ul>
  5. 6. DNA double helix
  6. 7. What are the nitrogen bases? <ul><li>There are 4 different nitrogen bases in DNA: </li></ul><ul><li>1. guanine - G </li></ul><ul><li>2. thymine - T </li></ul><ul><li>3. adenine - A </li></ul><ul><li>4. cytosine - C </li></ul>
  7. 8. How do the bases bond? <ul><li>The nitrogen bases always bond in the same way: </li></ul><ul><li>adenine to thymine A - T </li></ul><ul><li>guanine to cytosine G - C </li></ul>
  8. 9. Base Pairing
  9. 11. How are these parts put together? <ul><li>DNA is built up in small units. Each unit is made up of a sugar , a phosphate , and a nitrogen base . This small unit is called a nucleotide . </li></ul>

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