What is DNA?  DNA is where the GENETIC CODE is stored.  It is a set of instructions for building proteins  Sent by the CEO to the WORKERS as instructions.

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Topic: Genetics Aim: What is DNA?

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Presentation transcript:

What is DNA?  DNA is where the GENETIC CODE is stored.  It is a set of instructions for building proteins  Sent by the CEO to the WORKERS as instructions for building PROTEINS  Who are the workers?  The RIBOSOMES  Who is the CEO?  The NUCLEUS

Where is DNA?  DNA is found in the NUCLEUS of every cell in every organism.  DNA is like long string wound up very tightly around itself. When it is wound up it is called a CHROMOSOME.  Each human nucleus has 23 CHROMOSOMES

What is DNA made of?  DNA is shaped like a SPIRAL STAIRCASE.  The handrails the staircase are made of NUCLEOTIDES.  The steps of the stair case are made of BASES.  There are 4 bases used in the DNA molecule, and each pairs with another

What is DNA made of?  The NUCLEOTIDES (handrails) give the DNA molecule its structure.  The BASES (stairs) spell out the GENETIC CODE.  Remember: DNA is the instructions for how to build proteins. The BASES spell out the words in the instructions.

Draw a DNA molecule and label the Nucleotides and the Bases

How big is DNA and Chromosomes?  

Let’s review:  Every cell has a NUCLEUS. The nucleus is the CEO and contains all instructions for building proteins.  Every nucleus has 23 CHROMOSOMES (in humans)

Let’s review:  Each chromosome is made up of tightly wound DNA.  DNA looks like a spiral staircase.  The handrails are made of nucleotides, and give DNA it’s shape.  The stairs are made of bases, and store the genetic code

Exit Slip  1) What are the stairs of DNA made of and what purpose do they serve?  2) Where in the cell is DNA found?  3) DNA are instructions to build what?