I have no idea what I'm supposed to do. Can someone please help me? What is the difference between gene expression and protein synthesis?
closed as off-topic by David, canadianer, theforestecologist♦, Amory, iayork Jan 19 '18 at 20:20
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According to the homonymous article of Wikipedia
Gene expression is the process by which information from a gene is used in the synthesis of a functional gene product.
These products are often proteins, but in non-protein coding genes such as transfer RNA (tRNA) or small nuclear RNA (snRNA) genes, the product is a functional RNA.
As shown by this picture, gene expression consist of genetic transcription, that results in a mRNA, maturation of the mRNA (splicing, incorporation of a poly(A) tail, capping, ...) and finally protein synthesis by means of translation of the mature mRNA.
Again, the homonymous Wikipedia article tells us what is protein synthesis:
Protein synthesis is the process whereby biological cells generate new proteins [...]. Translation, the assembly of amino acids by ribosomes, is an essential part of the biosynthetic pathway, along with generation of messenger RNA (mRNA), aminoacylation of transfer RNA (tRNA), co-translational transport, and post-translational modification.
The following picture describes the process of mRNA translation by ribosomes that results in a polypeptide.
Once folded in its proper 3D structure, the polypeptide becomes a functional protein.
In order to work properly, some proteins need post-translational modifications, which is (citing Wikipedia again) the covalent modification of proteins following protein biosynthesis and goes beyond the scope of this answer.