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INTRODUCTION TO DNA By the end of this lecture you will know: The basic function of DNA The basic structure of DNA Who discovered the structure of DNA.

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Presentation on theme: "INTRODUCTION TO DNA By the end of this lecture you will know: The basic function of DNA The basic structure of DNA Who discovered the structure of DNA."— Presentation transcript:

1 INTRODUCTION TO DNA By the end of this lecture you will know: The basic function of DNA The basic structure of DNA Who discovered the structure of DNA

2 What is DNA Deoxyribonucleic acid Master copy of hereditary information

3 Function: DNA must 1.Carry information from one generation to the next. 2.Put that information to work. 3.Be easily copied.

4 DNA is Simple DNA is just a string of nucleotides A sugar and a nitrogenous base- just 3 parts

5 4 different bases 4 different nucleotides 1.Adenine 2.Thymine 3.Cytosine 4.Guanine

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8 Search for the structure By the 1950s everybody was looking for structure of DNA

9 Watson and Crick Discover the Structure of DNA

10 DNA – The Double Helix Model DNA twisted double helix ladder Rails sugar- phosphate backbone Rungs are nitrogenous bases

11 4 Bases Always Pair the Same Way Adenine-Thymine Cytosine-Guanine

12 REVIEW nucleotide: one sugar, one phosphate, one base. 4 bases –Adenine –Guanine –Cytosine –Thymine

13 Q Card Quiz What is……….. 1.The basic function of DNA 2.The basic structure of DNA 3.Name the four nitrogenous bases 4.Match the bases correctly


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