Reaction of iron(III) chloride with potassium iodide Animation Play

Reactions occurring at the electrodes Student activity Play

Reactions of commercially available galvanic cells Slideshow Play

Reactions that occur at the electrodes Student activity Play

Reactions that occur at the electrodes Glossary Play

Recombination in bacteria Animation Play

Regulation of the cell cycle Animation Play

Reproduction Student activity Play

Reproduction by cell division Student activity Play

Reproduction by cell division Whiteboard exercise Play

Reproduction in invertebrates Whiteboard presentation Play

Reproduction in invertebrates Class activity Play

Reproduction in mammals Student activity Play

Reproductive cells Animation Play

Reproductive organs Animation Play

Resistors Whiteboard presentation Play

Resistors Class activity Play

Rupture of the DNA molecule Slideshow Play

Sample endocrine glands Simulation Play

Sexual reproduction Student activity Play

Sexual reproduction Student activity Play

Sexual reproduction Slideshow Play

Sexual reproduction Whiteboard exercise Play

Sickle cell disease Slideshow Play

Sickle cell disease Student activity Play