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Cells
cells stucture
14
Science
7th Grade
01/22/2010

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Term
cell wall
Definition
the rigid, porous outer layer of a plant cell
Term
centriole
Definition
a bundle of microtubules that hepls orangize the movement of chromosomes during cell division
Term
chloroplast
Definition
an organelle that converts the radiant energy of the sun into chemical energy through the process of photosynthesis
Term
endoplasmic reticulum
Definition
a network of passageways in which chemical compounds are manufactured, processed, and transported
Term
golgi apparatus
Definition
a stack of membranes that collects, modifies, and packages chemical compounds
Term
lysosomes
Definition
a small sac that contains digestive chemicals
Term
mitochondria
Definition
organelles that, using oxygen, converts nutrients into energy that can be used by the cell
Term
nuclear envelope
Definition
a double-layered membrane that surrounds and protects the nucleus
Term
nucleolus
Definition
a small body in the nucleus where ribosomes are synthesized
Term
nucleus
Definition
a round body in the center of the cell that contains DNA and directs the cell's activities
Term
organelle
Definition
a cell structure the performs a specific function
Term
plasma membrane
Definition
a double-layered membrane the surrounds the cell. Also called the cell membrane, it regulates what eneters and leaves the cell
Term
plastid
Definition
small structure that can store food (leucoplast) or pigment (chromoplast)
Term
ribosomes
Definition
tiny structure where proteins are synthesized
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