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Chapter 3 Vocabulary
Cells the basic units of Life
19
Science
7th Grade
09/03/2013

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Cards

Term

 

 

Cell

Definition

 

 

The smallest unit that can perform all the processes necessary for life.

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

 

 

Organelle

Definition

 

one of the small bodies in a cell’s cytoplasm that are specialized to perform a specific function

 

 

Term

 

 

Nucleus

Definition

 

 an atom's central region, which is made up of protons and neutrons

 

 

 

 

Term

 

 

 

Prokaryote

Definition

 

a single-celled organism that does not have a nucleus or membrane-bound organelles; examples are archaea and bacteria

 

Term

 

 

Eukaryote

Definition

 

 

an organism made up of cells that have a nucleus enclosed by a membrane; eukaryotes include protists, animals, plants, and fungi but not archaea or bacteria

Term

 

 

Cell Wall

Definition

 

 

a rigid structure that surrounds the cell membrane and provides support to the cell

 

Term

 

 

Ribosome

Definition

 

 

a cell organelle composed of RNA and protein; the site of protein synthesis

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

 

 

Mitochondrion

Definition

 

 

 

the cell organelle that is surrounded by two membranes and that is the site of cellular respiration, which produces ATP

Term

 

 

Golgi complex

Definition

 

 

a cell organelle that helps make and package materials to be transported out of the cell

Term

 

 

Vesicle

Definition

 

 

a small cavity or sac that contains materials in a eukaryotic cell; forms when part of the cell membrane surrounds the materials to be taken into the cell or transported within the cell

Term

 

 

Lysosme

Definition

 

a cell organelle that contains digestive enzymes

 

Term

 

 

Tissue

Definition

 

 

 

a group of similar cells that perform a common function

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

 

 

 

Organism

Definition

 

 

 

a living thing; anything that can carry out life processes independently

Term

 

 

 

Structure

Definition

 

 

 

the arrangement of parts in an organism

Term

 

 

 

Function

Definition

 

 

the special, normal, or proper activity of an organ or part

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