Cells

Here is a website that has a sliding animation to demonstrate the size of cells and compares them to many other objects including viruses, parts of cells, and bacterium.  This would be a great visual for your students when introducing the cell.

Here is a quick video animation that demonstrates how Phagocytosis gets rid of bacteria from in the body.  

This animated and narrated video demonstrates how a flu virus exits one person and enters another.  Then it visually describes how the virus will be welcomed into a cell where it will replicate its DNA.  There is a great part that shows some Phagocytosis as your body tries to destroy the virus.

If you are just getting ready to teach a lesson on DNA, you might want to use this video to introduce the concept.  It does a good job explaining what DNA is and how small or large it is.

This "Stated Clearly" video discusses what genes actually are.  This video does an excellent job breaking down and demonstrating what genes actually are.  It also talks about how genes are used to produce hardy vegetables and other applications humans have developed..  Vocabulary used are: Nucleotides, Proteins, Hemoglobin, Pepsin, Keratin, Insulin

This animated "Clearly Stated" video does a great job describing and showing what DNA actually is. It goes furth discussing how the RNA leaves the nucleus and enters a ribosome in order to create proteins.  Vocabulary used are:  Amino Acids, DNA, Proteins, Cells, Tissue, Organs, Organism, Nucleus, and RNA.

This short animation explains how DNA can get a mismatch mutation and how the body repairs such an error.

This video clearly states what gene mutations are.  The Amoeba Sisters discuss Sickle Cell Anemia, gene mutations, DNA transfer, meiosis, environmental factors, substitution, insertion, and deletion.

In this biology video, students will grasp a better understanding of how cells divide through mitosis and meiosis, but the emphasis is on how through mitosis and meiosis, the daughter cells will either contain the same number of chromosomes or contain half the amount of chromosomes.