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DNA Presentation

DNA presentation, 4th period

Allison Johnson

on 1 February 2013

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Transcript of DNA Presentation

Allison Johnson DNA DNA REPLICATION What is DNA?
DNA is the brain of the cell. It contains genetic information. DNA is in the nucleus of eukaryotic cells and it stands for Deoxyribonucleic Acid.
The "twisted ladder" shape of the DNA molecule is called a double helix. A DNA strand is made of letters which make up words which make up sentences. The backbone is made of Sugar and Phosphate that connect by nitrogen pairs. These pairs are made of Adenine, Thymine, Guanine and Cytosine. Adenine and Thymine go always together (A-T) as Cytosine and Guanine do (G-C). A group of 3 letters in DNA is called codon. Structure of DNA DNA -----------------RNA---------------- Protein

2 phases:

1) Transcription
2) Translation DNA and Protein Synthesis 1) Transcription:
Occurs in the nucleus
mRNA copies info from DNA
RNA carries th genetic code from the nucleus to the cytoplasm
2) Translation:
Happens in the cytoplasm (on a ribosome)
mRNA starts making starts making amino acids and protein chains
The ribosome releases the protein chain DNA and Protein synthesis Process by which DNA copies itself
Happens when chromosomes copy themselves
Each new piece of DNA is made of 1 old strand and 1 new strand
DNA never leaves the nucleus WHAT IS mRNA?
mRNA is the messenger ribonucleic acid In DNA:
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