I don't understand the function of the endoplasmic reticulum

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JanaALEVEL
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There are free ribosomes in the cytosol of a cell, the proteins can be made in these ribosomes and then they can just go to the Golgi body/apparatus, be modified and then either leave the cell or stay. What's the point of another transport system ? All the ER does is transport the protein along its network and then bud it off as a vesicle.

I also don't understand the role of the Golgi body. I know it modifies proteins but why aren't the synthesised proteins ready the way they are ? How does the Golgi body know which protein needs to be modified to what ? Is it from the amino acid sequence ?
Ps, this might all be a load of crap, I just finished a level biology
Last edited by JanaALEVEL; 2 years ago
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Kallisto
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You are wrong when you think that ER is just doing transport the proteins. It is quite versatile: it is the place where the translation happens by matching the mRNA with tRNA and the amino acids. Furthermore the made proteins are folding and controlled in ER.

To the questions about the Golgi apparatus: although the synthesised proteins are used for what they made, it may happen that something is changing in metabolism process what required other proteins in turn. They are modified and then for another circles in metabolism. That is one reason why they are modified, another reason is that the protein which is needed does not match in structure because of wrong amino acids in. For all these happenings the post-translational modification is supposed to. The proteins are distinguish from their amino acids, so all what Golgi apparatus do is to change them. To know what protein has to synthesise or which to change, the transcription process exists.
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