Protein Synthesis

Protein Synthesis
What?
- Transcription
- synthesizing mRNA, directed by DNA
- Translation
- synthesizing polypeptide chain,
directed by RNA
When?
- a gene is directed to code for a protein
Who?
- Transcription
- DNA
- mRNA
- Nucleotides of RNA
- Translation
- mRNA
- tRNA
- Ribosomes
- Amino Acids
Why?
- Transcription
- To create new copies of mRNA
- Translation
- To create new amino acid
chains, forming new proteins
How?
- Transcription
- 1) DNA begins to uncoil
- 2) One strand begins synthesis
- 3) mRNA is synthesized
- 4) Both DNA strands recouple
- 5) Processed mRNA leaves
nucleus, enters cytoplasm
- Translation
- 1) tRNA carries amino acids to mRNA
- 2) tRNA anticodon pairs with mRNA codon
- 3) Ribosomes move down mRNA chain
- 4) First tRNA detaches from
mRNA, allowing it to advance
forward
- 5) When "STOP" codon is reached, process ends
and an animo acid chain is released from the
ribosome
- 6) Amino acid chains become proteins
Where?
- Nuclear Envelope
- Translation
- Cytoplasm
- Transcription
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