10.9.2006 - II A 2 Endomembrane system continuous membranes...

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II. A. 2. Endomembrane system: +/- continuous membranes forming the: a . Rough endoplasmic reticulum : rough because of ribosomes on its surface i. produces membrane and transport vesicles ii. ribosomes: manufacture proteins b. Smooth endoplasmic reticulum i. Lipid production ii. Ca+ storage (muscle contraction) iii. break down toxic substances in liver c. Golgi apparatus: modifies and packages substances received from the ER (Endoplasmic Reticulum) d. Lysosomes : formed by the ER and Golgi apparatus: contains hydrolytic enzymes that break down and recycle substances. e. Vacuoles i. central vacuole in plants: water storage, metabolic by-products, pigments ii. Digestion, storage, water balance, cell size. f. Chloroplasts : in plant cells i. Conversion of light energy into chemical energy ii. O 2 production iii. Not a part of the endomembrane system . g. Mitochondria i. Cellular respiration: conversion of high potential energy glucose molecules into accessible chemical energy as ATP ii. Not a part of the endomembrane system .
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