Anonymous #1
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Report Thread starter 7 months ago
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Explain protein synthesis to me? ( a level bio aqa )
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username5347244
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Protein synthesis is the process in which cells make proteins. It occurs in two stages: transcription and translation. Transcription is the transfer of genetic instructions in DNA to mRNA in the nucleus. After the mRNA is processed, it carries the instructions to a ribosome in the cytoplasm.
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kusum84
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Protein synthesis is the process in which cells make proteins. There are 5 major stages of Protein Synthesis each requiring a number of components in E. coli and other prokaryotes.
(a) Activation of amino acids,
(b) Transfer of amino acid to tRNA,
(c) Initiation of the polypeptide chain,
(d) Chain Termination,
(e) Protein translocation
For a detailed guide, you can read the Canadian Pharmacy website.
Last edited by kusum84; 7 months ago
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nerviodor
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Transcription: DNA Helicase unzips the DNA strand by breaking hydrogen bonds between base pairs,only one of the strands acts as a template, free RNA nucleotides bind to the complementary bases on the DNA template strand by forming hydrogen bonds, RNA polymerase joins RNA nucleotides together by forming phospodiester bonds, pre-mRNA strand detaches from template, introns are removed and expos are spliced together making mature mRNA.

Translation: the mRNA strand attaches at the ribosome by the start codon, a tRNA molecule with an anticodon complementary to the codon on the mRNA strand and it’s specific amino acid binds to the mRNA, then another tRNA molecule with an anticodon complementary to the second codon in the mRNA comes along bind to 2nd codon on mRNA and a peptide bond form between the two amino acids, the first tRNA molecule is discharged and is ready to collect another specific amino acid, ribosome moves along mRNA and this process continues until a stop codon is reached.
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kusum84
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(Original post by nerviodor)
Transcription: DNA Helicase unzips the DNA strand by breaking hydrogen bonds between base pairs,only one of the strands acts as a template, free RNA nucleotides bind to the complementary bases on the DNA template strand by forming hydrogen bonds, RNA polymerase joins RNA nucleotides together by forming phospodiester bonds, pre-mRNA strand detaches from template, introns are removed and expos are spliced together making mature mRNA.

Translation: the mRNA strand attaches at the ribosome by the start codon, a tRNA molecule with an anticodon complementary to the codon on the mRNA strand and it’s specific amino acid binds to the mRNA, then another tRNA molecule with an anticodon complementary to the second codon in the mRNA comes along bind to 2nd codon on mRNA and a peptide bond form between the two amino acids, the first tRNA molecule is discharged and is ready to collect another specific amino acid, ribosome moves along mRNA and this process continues until a stop codon is reached.
Well described.
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