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DNA "The Blueprint of Life".

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Presentation on theme: "DNA "The Blueprint of Life"."— Presentation transcript:

1 DNA "The Blueprint of Life"


3 DNA stands for... DeoxyriboNucleic Acid

4 DNA FACTS established by James Watson and Francis Crick
Shape of a double helix

5 codes for your genes  (traits)
made of repeating subunits called nucleotides

6 What is a nucleotide? Has three parts: PHOSPHATE DEOXYRIBOSE (sugar)

7 Base-Pair Rule Adenine <==> Thymine Guanine <==> Cytosine
The sides of the DNA ladder are phosphate & sugar held together by  hydrogen bonds

8 Base Pair Rule One side:     A   T   A      T   C   A      T   G   C      G   G   G Other side:



11 How the Code Works The combination of A,T,G,C determines what traits you might have, for ex. C A T C A T   =  purple hair T A C T A C  =  yellow hair

12 Think of the bases of DNA like letters. Letters form words
Think of the bases of DNA like letters. Letters form words.... Words form sentences....                 *endless                combinations

13 Let's Review What We Know About DNA
1.  DNA stands for:   De _____ ribo ______  acid 2.  What is the shape of DNA? _______________ 3.  Who established the structure of DNA?  ____________ 4.  Adenine always pairs with _______________ 5.  The sides of the DNA ladder are deoxyribose and _____ 6.  Guanine always pairs with _____________ 7.  What is the complimentary sequence:   A A T  G  C A 8.  The two sides of DNA are held together by _______ bonds. 9.  DNA is composed of repeating subunits called ______________________ 10.  What are the 4 bases that make up the rungs of the DNA ladder? _______________________________________

14 DNA REPLICATION the process by which DNA makes a copy of itself (cell division) SEMI-CONSERVATIVE - half of the old strand is saved


16 RNA - the messenger. single strand. ribose sugar
RNA - the messenger   *single strand *ribose sugar *contains no thymine, uracil instead *follows base pair rule DNA:   A  T  A   G  C  G RNA:  

17 RNA carries the "message" to the ribosomes, where proteins are made


19 DNA --> RNA --> Protein
Proteins are the building blocks of the organism (traits)

20 Transcription -  process where RNA is made from DNA Translation - process where proteins are made from RNA


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