Professor Munster's lesson on Gene Expression
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Gene Expression Professor Munster
Today we will be talking about Gene Expression
The first step is transcription. In this step mRNA is produced by RNA Polymerase, and the resulting mRNA is processed.
1. A molecule of DNA unwinds and separates. RNA Polymerase bind to the promoter of the template strand. 2. RNA Polymerase moves along the template strand and synthesizes the mRNA molecules. 3. Introns are removed and Exons are spliced together to form a mature mRNA molecule.
In Translation, mature a mRNA molecule is used as a template to assemble a series of amino acids to produce a polypeptide with a specific amino acid sequence.
What happens after that Professor Munster?
Then comes Translation!
Protein Synthesis: anticodons in a tRNA molecule interpret genetic information stored in DNA into the amino acid sequence.
In Eukaryotes, transcription occurs in the nucleus and translation happens in the cytoplasm.
1. rRNA binds to the 5' end of the mRNA molecule and moves to the 3' end until it meets the start codon (AUG). Then it forms a complex with the large unit of the ribosome with a tRNA molecule. 2. The codons on the mRNA determine which tRNA molecule linked to an amino acid binds to the mRNA. 3. This process ends when the mRNA reaches a stop codon (UAA, UAG, UAG)
Great Job guys! Now you know what Gene Expression is, and how it works! Class Dismissed!
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