Go to old Version of website

To Earth Science

To Physical Science

To Science Skills

To Life Science Main


Defining Life


The Microscope


The Cell


The Cell's



Cells in Organisms


Matter and Energy Cycles


Organsim Interactions


Plant and Animal Adaptations


DNA and Chromosomes




Sexual and Asexual Reproduction


Punnet Squares




Natural Selection


Artificial Selection

Human Body

Cells to Body Systems


Nervous Systems


Immune System


Life Science Links


The Cell Is Alive

Get and Use Energy: Photosynthesis

Chloroplast, found in plant cells, are responsible for photosynthesis.

Photosynthesis uses energy from the sun, water, and Carbon Dioxide to make food, in the form of a sugar called glucose. The process also makes oxygen that animals, including humans, and other organisms can use to breath.



Get and Use Energy/Metabolism: Cellular Respiration

Mitochondria, found in both plant and animal cells, are responsible for cellular respiration.


The process of cellular respiration breaks down food such as sugar and release the energy in the form of ATP for the cell to use. This happens in both plant and animal cells.



Cellular Respiration and Photosynthesis working together

Photosynthesis and Respiration are going on all the time. Plants take carbon dioxide from the air and give off oxygen. Animals, and other organisms, use oxygen and give off carbon dioxide. This is show below.


Grow, Develop, and Reproduce: Mitosis

Cells Divide because:

1) Repair: Cells have a limited life and need to be replaced with newer ones

2) Growth: As an organism grows it needs more cells.


Mitosis the the process used to make more cells


Image Credit: By Mysid - Vectorized in CorelDraw by Mysid from http://www.ncbi.nlm.nih.gov/About/primer/genetics_cell.html., Public Domain, https://commons.wikimedia.org/w/index.php?curid=1414818


When Mitosis Goes Wrong: Cancer


Cancer is a disease in which cells multiply out of control, over and over, destroying healthy tissue




Respond and Homeostasis: Osmosis and Diffusion


Diffusion is the movement of molecules from a crowded area to a less crowed area.

In cells molecules move through tiny holes in the cell membrane. Only molecules small enough to fit through the holes are let in.


Image Credit: By BruceBlaus - Own work, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=29452222


Osmosis is the diffusion of WATER molecules through a membrane.


Click here for an simple animation of osmosis. Will not work on IOS (ipads, iphones) devices.


Learn More

Next to Cells in Organisms Coming Soon!