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ch 3 LS HRW
ch 3 LS HRW
19
Biology
7th Grade
04/11/2012

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Term
cell
Definition
the smallest unit that can perform all life processes
Term
cell membrane
Definition
a phospholipid layer that covers a cell's surface and acts as a barrier between the inside of a cell and the cell's environment
Term
cell wall
Definition
a rigid structure that surrounds the cell membrane and provides support to the cell
Term
endoplasmic reticulum
Definition
a system of membranes that is found in a cell's cytoplasm and that assists in the production, processing and transport of proteins and in the production of lipids
Term
eukaryote
Definition
an organism made up of cells that have a nucleus enclosed by a membrane
Term
function
Definition
the special, normal, or proper activity of an organ or part
Term
Golgi body
Definition
a cell organelle that helps make and package materials to be transported out of the cell
Term
lysosome
Definition
a cell organelle that contains digestive enzymes
Term
mitochondrion
Definition
the cell organelle that is surrounded by two membranes and that is the site of cellular respiration, which produces ATP
Term
nucleus
Definition
a membrane bound organelle that contains the cell's DNA and that has a role in processes such as growth, metabolism, and reproduction
Term
organ
Definition
a collection of tissues that carry out a specialized function of the body
Term
organ system
Definition
a group of organs that work together to perform body functions
Term
organelle
Definition
one of the small bodies in a cell's cytoplasm that are specialized to perform a specific function
Term
organisms
Definition
a living thing; anything that can carry out life processes independently
Term
prokaryote
Definition
a single-celled organism that does not have a nucleus or membrane-bound organelles
Term
ribosome
Definition
a cell organelle composed of RNA and protein
Term
structure
Definition
the arrangement of parts in an organism
Term
tissue
Definition
a group of similar cells that perform a common function
Term
vesicle
Definition
a small cavity or sac that contains materials in a eukaryotic cell
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