Answer to Question #166641 in Molecular Biology for Aliya

Question #166641

1.     Describe the process of protein synthesis. You answer must include the two major steps, all major enzymes and molecules involved, where each step occurs in the cell and a summary of what happens in each step. (4 marks)


 There are two processes that occur during protein synthesis, transcription and translation. In transcription, DNA is used as a template to make the messenger RNA (mRNA). Transcription occurs in the nucleus of eukaryotic cells. However, translation occurs when the mRNA leaves the nucleus and goes to a ribosome in the cytoplasm of eukaryotic cells. During translation, the genetic code in mRNA is read and is used to make a protein. There are three steps in translation: initiation, elongation and termination. Initiation: the mRNA and the tRNA bind to the ribosome. Elongation: are amino acids that are added on one at time to the growing protein chain. The tRNA associates the anticodon to the codon of the mRNA and transports each time the correspondent amino acid, the peptidyl transferase forms the peptide bonds between amino acids.

Termination: is when there is a stop codon (UGA, UAG and UAA) the tRNA recognizes it, and it released and the translation ends.

This is my answer for this question. I want to know if I answered this correctly.


Expert's answer

During translation, the genetic code in mRNA is read 

Suggested correction: is read by tRNA and the protein is synthesized according to the message present on mRNA.

Suggested correction:

Initiation: The initiation always starts from AUG codon and hence the first added amino acid is always methionine.

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