Biology Lecture 12 - Biology Lecture 12 Ribosomal subunits...

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Biology Lecture 12 Ribosomal subunits are synthesized in the nucleolus Ribosomes are made up of rRNA (ribosomal RNA) and protein Made up of a large subunit and a small subunit Carry out protein synthesis in two locations i.in the cystol (free ribosomes) ii. on the outside of the ER or the nuclear envelope (bound ribosomes) Bound ribosomes are producing proteins that are going to be bound (or apart) of a membrane Rough ER has bound ribosomes and smooth ER doesn’t Components of endomembrane system Nuclear envelope Endoplasmic reticulum (smooth and rough) Golgi apparatus Lysosomes Vacuoles Plasma membrane (not endo, but related) Components of the endomembrane system are continuous or connected by vesicles (sacks surrounded by membrane) ER accounts for more than half of the total membrane in many eukaryotic cells (not found in prokaryotic) It’s continuous with the nuclear envelope Two types: i.smooth ER- lacks ribosomes ii. rough ER- contains ribosomes ER lumen is the space inside the ER
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Biology Lecture 12 - Biology Lecture 12 Ribosomal subunits...

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