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Grade 7 Chapter 2:4
Looking inside Cells
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07/28/2006

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Term
organelle
Definition
small structures in the cytoplasm that do special jobs to keep the cell working properly
Term
cell wall
Definition
surrounds the cell membrane of a plant; provides protection, support and gives shape
Term
cell membrane
Definition
doorway of the cell; controls the movement of materials into and out of the cell
Term
nucleus
Definition
the control center of the cell; controls everything that happens in the cell; the brain
Term
nuclear envelope
Definition
thin covering that surrounds the nucleus; controls what material passes into or out of the nucleus
Term
nucleolus
Definition
where ribosome's are made
Term
cytoplasm
Definition
located between the nucelus and cell membrane; gives cell its shape
Term
mitochondria
Definition
powerhouse of the cell; store and releases energy the cells needs by breaking down sugars
Term
endoplasmic reticulum
Definition
tubes or "roadways" used for moving materials within the cell; carries proteins from one part of cell to another
Term
ribosomes
Definition
found attached to the endoplasmic reticulum or moving freely in the cytoplasm; makes and stores protein needed for growth
Term
Golgi Bodies
Definition
receives proteins from the endoplasmic reticulum, package them and sends them to other parts of the cell
Term
chloroplasts
Definition
found in the cytoplasm of plant cell;needed for food making -captures energy of sunlight through the leaf cells
Term
vacuoles
Definition
liquid filled spaces that store food, waste products
Term
lysosomes
Definition
break down large food molecules to smaller ones, then pass to the mitochondrias to burn in energy
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