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Chapter 3 Cells The Living Units

Contact signaling electrical signaling chemical

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Unformatted text preview: operation of a G proteinlinked receptor Organelles and their functions Cells are complex, dividing labor between portions of the cells Use organelles (little organs) to maximize efficiency of reactions Suspended in the cytoplasm (cytosol) are these structures Details are covered in lab Mitochondrion Powerhouse of the cell: Generation of ATP Have cristae with enzymes Have their own DNA and RNA The endoplasmic reticulum Two types: Rough ER (ribosomes) and Smooth ER (no ribosomes) Transport proteins (RER), lipid metabolism and synthesis (SER) The signal mechanism targets ribosomes to the ER for protein synthesis Ribosomes Protein synthesis Composed of Ribosomal RNA Free: proteins for cytosol Membranebound: proteins for cell membranes and export Golgi apparatus Golgi apparatus Repackage proteins Attach molecules (sugars, etc) Secretory vessicles to transport product Role of the Golgi apparatus in packaging proteins for cellular use and for secretion The endomembrane system Lysosome: Enzymes Vacuoles: Storage Endoplamsic reticulum Golgi apparatus Peroxisomes: remove free radicles What gives cells their shape? Are organelles static within the cell? How do things move? Cytoskeleton (cell skeleton) Filaments Centrioles Cilia and Flagella Cilia structure and function The Nu...
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