2A and 2B

A model simplifies something in the world to explain it , describe, or represent it. MODELS ARE SUBJECT TO BEING CHANGED OR REPLACED.

• All living things are made of one or more cells. • All cells come from preexsisting cells. • Cells perform the functions of living things.

A cell with a nucleus

A cell without a nucleus

Having only one cell

Having more than one cell

The smallest working unit of an organism

A group of tissues that work together

A group of similar cells that work together

The usually membrane surrounded structures in a eukaryotic cell that performs special functions.

The structure that surrounds all cells and regulates what comes in and goes out

A rigid structure that surrounds and protects some cells

A slimy layer surrounding some bacteria that protects them from harmful substances and prevents their drying out

The material inside of cell EXCLUDING the nucleus

A whip like structure that some cells used to propel themselves through their environment

The molecule that contains important information for making proteins and helps regulate many cellular processes

A structure that contains a cells DNA

A network of tubes in eukaryotic cells that help produce and transport proteins and other molecules throughout the cell

the structure that holds and protects the DNA in a eukaryotic cell

The organelles in the eukaryotic cell that modifies many proteins and packages them into small bubble like structures called vesicles

A small structure that assembles proteins found in both prokaryotic and eukaryotic cells

Several types of long thin fibers anchored to various parts of the cell that help the cell maintain and change its shape

A small organelle in a eukaryotic cell that acts as the demolition crew within a cell

A protein that speeds up or slows down chemical reactions