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| Determines which substances enter and which substances leave the cell. It is selectively permeable. |
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| Control center for all cell functitions. Semi-permeable membrane. Withing the nucleusare chromosomes and the nucleolus. |
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| site of RNA synthesis and maybe responsible for the production of ribosomes. |
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| The material outside the nucleus. It is made mostly of water. Within the cytoplasm are various organelles of the cell. The cytoplasmprovides the envirmonment in which the organelles carry on life processes of the cell. |
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| Double membrane for extra surface area. This is the place of most cells' RESPIRATION. The energy released during respiration is stored in the form of ATP. |
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| Small, dense granules found free in the cytoplasm or in the ER. Ribosomes are composed of RNA. They are the centers of protein synthesis in the cell. |
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| A membrane-bounded system of channels or tubes through which materials are transported within the cell. The membranes or the ER may also serve as sites of biochemical reactions. Ribosomes are found only in Rough ER. Rough endoplasmic reticulum is found mainly in cells involved in protein synthesis. Smooth, which has no ribosomes, is found in cells involved in synthesis of nonprotein substances. |
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| Made up of a series of membrane-enclosed sacs, and it is usually found near the nucleus. This organelle is associated with the production of lysosomes and withthesynthesis of various secretions. |
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| Packages or sacs of digestive contents until they are needed. Lysosomes, which are found mainly in animal cells, are egg shaped structures enclosed by membrane. |
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| Keeps a plant cell's shape. It is made of cellulose and chitin. |
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| Found only in plant cells and in some protists. They contain the green pigment, chlorophyll, which carries on the process of photosynthesis. In photosynthesis, light energy is used for the manufacture of food. |
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| Membrane-enclosed structures that are generally filled with water containing various dissolved substances. Only in protists and plant cells. Stores undigested foor, water, and waste |
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| Found just outside the nucleus in animal cells. Within the the centrosome are two during the cell division. centrioles are also associated with the formation of cells and flagella in a wide variety of cell types |
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