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Cells
cell structure
15
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 helps organize the movement of chromosomes during cell division.
Term
Chloroplast
Definition
an organelle that converts the radient energy of the sun into chemical energy through the proccess of photosynthesis
Term
Cytoplasm
Definition
a jelly like substance,composed mainley of water,occupying most of the space between the cell membrane and the nucleus.
Term
Enoplasmic reticulum
Definition
a network of passageways in wich 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,convert nutrients into energy that can be used by the cell.
Term
Nuclear envelope
Definition
a doubled layered membrane that surrounds and protects the nucleouse.
Term
Nucleolus
Definition
a small body in the nucleus where ribosomes are synthesized.
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 cells activities.
Term
Organelle
Definition
a cell stucture that performs a specific function.
Term
Plasma membrane
Definition
a doubled layered membrane that surrounds the cell. also called the cell membrane,it regulates what enters and leaves the cell.
Term
plastid
Definition
small sructure that can store food or pigment
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