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Chapter 2
Cells
22
Science
7th Grade
10/05/2006

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Term
organelles
Definition
the structures that make up the cells
Term
ribosomes
Definition
protein making sites of the cells
Term
Anton van Leeuwenhoek
Definition
scientist who was the first to "see" animalcules (tiny living things)
Term
nucleus
Definition
the control center of the cell
Term
organ (example)
Definition
heart
Term
cell theory
Definition
theory that states all living things are made up of cells
Term
mitochondria
Definition
structure that supplies the cell with most of the energy
Term
cell membrane
Definition
outer covering of an animal cell
Term
tissues
Definition
cells that are similar in structure and function join together
Term
vacuole
Definition
sac in the cytoplasm of a cell that stores water, food, and other materials
Term
nucleic acids
Definition
DNA RNA
Term
least comples structure of a living thing
Definition
cell
Term
lysosomes
Definition
small round structure in the cell that are involved in digestive activity
Term
groups of different tissues that work together
Definition
organism
Term
cytoplasm
Definition
all the living material of the cell that lies outside the nucleus
Term
endoplasmic reticulum
Definition
protein are transported from the nuclear membrane to other parts of the cell
Term
blood
Definition
liquid tissue in the human body
Term
organ system
Definition
groups of different organs that work together
Term
organism
Definition
highest level of organization of living things
Term
ribosomes
Definition
thin rodlike structure floating in the nucleus
Term
cell membrane
Definition
food and other materials enter and leave the cell through openings
Term
chloroplast
Definition
a structure that uses the energy of the sun to make food for a plant cell
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