The Synthesis And Transport Of Protein- Synthesis Of Membrane Components Flashcards
Where are lipids and proteins synthesised?
In the ER
What is the difference between the smooth ER and the rough ER?
The SER has a lack of ribosomes where as the RER has ribosomes on its cytosolic face
Where are lipids synthesised and then what happens to them?
They are synthesised in the SER and then inserted into its membrane
Where does the synthesis of all proteins begin
In cytsolic ribosomes
Where is the synthesis of cytosolic proteins completed and where do they go?
Cytosolic ribosomes and the proteins remain in the cytosol
What do transmembrane proteins carry?
A signal sequence
What do transmembrane proteins’ signal sequence do?
It halts translation and directs the ribosome synthesising the protein to dock onto the ER forming the RER
What is a signal sequence?
It is a short stretch of amino acids at one end of the polypeptide that determines the eventual location of a protein in a cell
What happens when the transmembrane protein docks the ER?
Translation continues and the protein is inserted into the membrane of the ER
