Unformatted text preview: ing facilities • Site of production of almost all the cell’s lipids • Site of production of transmembrane proteins, proteins destined for secretion and for other organelles The Golgi Apparatus
• Centre for sorting and shipping in the cell • Consists of a set of flattened sacs • There is a receiving and a shipping end • Vesicles are shipped to other organelles or to the cell membrane The Golgi Apparatus Lysosomes
• Membranous sac of digestive enzymes found only in animal cells • Main site of intracellular digestion • 1. 2.
Lysosomes carry out two processes: Digestion of food Digestion of unwanted organelles Importance of Lysosomes Importance of Lysosomes
• Sculpturing functions in early embryonic development • Lysosomal storage diseases, e.g. Tay Sachs, resulting from lack of functioning hydrolytic enzyme to defective lysosomal function • There are about 40 diseases arising due Vacuoles
• Sacs that bud from the ER, Golgi, or plasma membrane • 1. 2. 3. Carry out cell type dependent functions: Food vacuoles Contractile vacuole Central vacuole specific to plant cells Filling vacuole 50 µm Contracting vacuole Contractile Vacuole of Paramecium The Plant Cell Vacuole
Central vacuole Cytosol Nucleus Central vacuole Cell wall Chloroplast 5 µm Nucleus Rough ER Smooth ER Plasma membrane Nucleus Rough ER Smooth ER cis Golgi trans Golgi Plasma membrane Nucleus Rough ER Smooth ER cis Golgi trans Golgi Plasma membrane Summary
• Biologists use microscopes to study cells • Eukaryotic cells have internal membranes that compartmentalize their functions enclosed organelles • Prokaryotes lack nuclei and other membrane • Nuclear envelope is continuous with the ER • The ER and the Golgi Apparatus are ‘connected’ via vesicles BIO115 The Cell II Jessica Pamment Overview
• Organelles that act as power stations: Mitochondria and chloroplasts • The Cytoskeleton: internal scaffolding Mitochondria and Chloroplasts Mitochondria and Chloroplasts
• Change energy from one form to another to provide cellular energy • Contain large amount of internal membrane •...
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