DNAWhat are genes? (4 min)

Bill Nye http://www.youtube.com/watch?v=V9BZ3zx8b8I&feature=related

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Where is it located?

Title: The DNA Date: August 27,2012

Summary:

http://www.youtube.com/watch?v=sf0YXnAFBs8&feature=relatedHistory of DNA

Chromosome: a coiled, double rod-shaped form of condensed DNA that forms during cell division.

Image source: http://www.dnalc.org/home.html

DNA is a complex molecule found in all living things.

The primary function of DNA is to store and transmit genetic information that tells cells which proteins to make and when to make them.

An idea about size:   An average cell nucleus is about 6 micrometers in diameter.

The total length of the DNA in the human genome is 1.8 meters.

There must be several levels of coiling and supercoiling in DNA.

In 1953, James Watson and Francis Crick proposed a model for the DNA molecule that consisted of two nucleotide chains that wrap around each other to form a double spiral. This shape is called a double helix.