BIO130H1 Lecture : Second Section Lecture 5
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BIO130H1 Full Course Notes
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Cytosol: half of cell volume, degradation and synthesis of proteins, small molecules for metabolism, not an organelle. Organelles: subcellular component with distinct function, usually membrane enclosed. Lysosome/vacuole (in plants): digestive enzyme: golgi apparatus: modifies proteins and lipids, mitochondrion: used for atp synthesis, nucleus: dna/rna synthesis, rer (rough endoplasmic reticulum): synthesis of various proteins, ser (smooth): phospholipid synthesis, detoxification. Endosome: endocytosis, absorbs other molecules by engulfing them. Endomembrane system: composed of endosome, peroxisome, ers, golgi apparatus, lysosome/vacuole. Involved in two main pathways: biosynthetic/secretory pathway, proteins and lipid made in er (biosynthesis, delivered to other organelles (bio, helps secreted proteins move out of the cell through exocytosis (secretion, endocytic pathway. 15/12: move contents into cell through endocytosis. Vesicle: membrane-enclosed organelle that transports components in endomembrane system. Exocytosis: transported vesicle content delivered to extracellular space, vesicle membrane fused with cell plasma membrane, secretion. Endocytosis: cell plasma membrane forms vesicle membrane, vesicle contents come from extracellular space, engulfing.