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Ch 17 From Gene to protein
Genetics
7
Biology
Undergraduate 1
11/04/2012

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Term
Gene Expression
Definition
Is the process by which DNA directs the synthesis of proteins (in some cases, just RNAs)
Term
Transcription
Definition
Is the synthesis of RNA under the direction of DNA. results in mRNA.
Term
mRNA
Definition
Messenger RNA. It carries a genetic message from the DNA to the protein-synthesising machinery of the cell.
Term
Translation
Definition
Is the synthesis of a polypeptide, which occurs under the direction of mRNA. The cell must translate the base sequence of an mRNA molecule into the amino acid sequence of a polypeptide.
Term
Ribosomes
Definition
Is the site where translation takes place. Are complex particles that facilitate the orderly linking of amino acids into polypeptide chains.
Term
Triplet code
Definition
The genetic instructions for a polypeptide chain are written in the DNA as a series of non-overlapping, three-nucleotide words.
Term
Codons
Definition
The mRNA base triplets and they are customarily written in the 5'->3' direction.
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