Biol 225 Topic 4

Membrane systems

what is the endomembrane system comprised of?

ER, Golgi, endosomes, & lysosomes 

Are peroxisomes included in the endomembrane system? why or why not?

no, they don’t receive vesicles from the golgi apparatus 

what happens in the rough ER?

site of protein production and modification, and lipids synthesis

How are ribosomes associated with the ER?

associated non-covalently, but they stick on well to the ER though

What is the difference between bound & free ribosomes?

free ribosomes are in the cytoplasm and make proteins for use within the cell, while bound ribosomes are attached to the ER

what do free ribosomes make proteins for?

• cytosol, ER, nucleus, mitochondrion, chloroplast, peroxisome

  • proteins that will be used within the cell's cytosol, such as enzymes and proteins for structural purposes

what do bound ribosomes make proteins for?

• proteins are translocated into ER lumen as they are being made

  • produce proteins for secretion, insertion into membranes, or transport to organelles like lysosomes

what does SRP stand for

Signal Recognition Particle