Cells- Introduction

Cell Theory:

·        All living things are made of cells.

·        Cells are the smallest working units of all living things.

·        All cells come from pre-existing cells through cell division.

Definition of Cell: A cell is the smallest unit that is capable of performing life functions.

Examples of Cells: Amoeba proteus, Red Blood Cell, Bacteria, Nerve Cell

Two types of cells:

·    Prokaryotic

·    Eukaryotic 

Prokaryotic

·     Do not have organelles (specialized structure in cells) surrounded by membranes

·     Few internal structures

·     One-celled organisms (eg. bacteria)

                                      Prokaryotic Cell

(source: http://library.thinkquest.org/C004535/prokaryotic_cells.html)

 

Eukaryotic

·        Contain organelles surrounded by membranes

·        Most living organisms (eg. Plant, Animals, Fungi)

Eukaryotic Cells

(source: http://library.thinkquest.org/C004535/eukaryotic_cells.html)