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cells
cell structure
19
Science
7th Grade
01/22/2010

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Term
cell wall
Definition
the rigid, potous outer layer of a plant cell
Term
centriole
Definition
a bundle of microtubes that helps organize 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
cytoplasm
Definition
a jelly-like substance ,composed mainly of water, occupying most of the space between the cell membrane and the nucleus
Term
endoplasmic reticulum (er)
Definition
a network of passage ways 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
organnelles that, using oxygen, convert 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 were ribosomes can be 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 that performs a specific function
Term
plasma membrane
Definition
a double-layered membrane that surrounds the cell. also called cell membrane, it regulates what enters and leaves the cell
Term
plastid
Definition
small structure that can store food(leucoplast) or pigment (chromoplast)
Term
plastid
Definition
small structure that can store food(leucoplast) or pigment (chromoplast)
Term
plastid
Definition
small structure that can store food(leucoplast) or pigment (chromoplast)
Term
ribosomes
Definition
tiny structure where protiens synthesized
Term
vacuole
Definition
sac that stores water, nutrients, and other chemicals. the large vacuole found in plant cells helps the cells maintain their shape
Term
vesicle
Definition
small package of nutrients or protiens created by the golgi apparatus
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