The Student Room Group
Uni students - Complete our survey >>
Uni students - Complete our survey >>
Uni students - Complete our survey >>

This discussion is now closed.

Check out other Related discussions

Urgent Biology - Protein Synthesis

Can someone please explain this step by step becuase i am finding it hard to understand. Quick reply soon because my exam is tomorrow

cheers
Reply 1
Avatar for Theorist
Theorist
10
• The DNA triplet code codes for the manufacture of amino acids and is found in the nucleus
• The sequence of amino acids determines the protein which is manufactured
• Amino acids are present in the cytoplasm
• Proteins are manufactured by ribosomes in the cytoplasm

Therefore:
• The DNA code must be transferred from the nucleus to a ribosome: the DNA code is transcribed onto an mRNA molecule
• Amino acids must be brought to the ribosome to be assembled into a protein: each tRNA molecule has a codon which allows it to combine with only a particular amino acid; tRNA carries amino acids to the ribosome

Protein synthesis:
• The gene that codes for the protein is activated in the DNA
• The codons are transcribed onto an mRNA molecule
• The mRNA travels from the nucleus to a ribosome through the pores of the nuclear membrane
• The mRNA combines with a ribosome
• Each tRNA molecule carries a specific amino acid to a ribosome
• The tRNA with the correct amino acid to fit the codon on the mRNA enters the ribosome and its amino acid is joined onto the corresponding codon
• This continues for the entire mRNA molecule; the amino acids are joined together chemically
• Once the entire mRNA molecule has been read, the correct protein (polypeptide) is formed
• The protein then folds itself into shape

Hope this helps,

Sen

P.S. It doesn't matter if you don't really understand protein synthesis. Just make sure you learn all the steps - do that and you can still get full marks in a question on it. :smile:

Related discussions

Latest

Trending

Trending

Articles for you