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Cells
Basics of Cells
9
Science
7th Grade
11/12/2009

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Term
Cell
Definition
In biology, the smallest unit that can preform all life processes; cells are covered by a membrane and have DNA and cytoplasm
Term
Cell Membrane
Definition
A phospholipid layer that covers a cells surface; acts like a barrier between the inside of a cell and the cells environment
Term
Organelle
Definition
One of the small bodies in a cells cytoplasm that are specialized to preform a specific function
Term
Nucleus
Definition
In a eukaryotic cell, a membrane bound organelle that contains the cell's DNA and that has a role in processes such as growth, metabolism, and reproduction
Term
Prokaryotic
Definition
An organism that contains of a single cell that does not have a nucleus
Term
Eukaryotic
Definition
An organism made of cells that have a nucleus enclosed by a membrane; eukaryotes include animals, plants and fungi but not archaea and bacteria
Term
Cell Wall
Definition
A rigid structure that surrounds the cell membrane and provides support to the cell
Term
Riposomes
Definition
A cell organnelle composed of DNA and protein; the site of protein sinthesis
Term
Endlplasmic Raticulum (ER)
Definition
A system of membranes that is found in a cells cytoplasm and that assists inthe production processing and transport of proteins and in the production o lipeds
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