Puberty in males Slideshow Play

Radio waves Student activity Play

Radio waves and microwaves Student activity Play

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 Glossary Play

Reactions that occur at the electrodes Student activity Play

Recombination in bacteria Animation Play

Regulation of gene expression Slideshow Play

Regulation of gene expression in eukaryotes Student activity Play

Regulation of the cell cycle Animation Play

Reproduction by cell division Student activity Play

Reproduction by cell division Whiteboard exercise Play

Reproductive cells Animation Play

Resistors Whiteboard presentation Play

Resistors Class activity Play

Rupture of the DNA molecule Slideshow Play

Sexual reproduction Student activity Play

Sexual reproduction Whiteboard exercise Play

Sickle cell disease Slideshow Play

Sickle cell disease Student activity Play

Sickle cell disease and malaria Illustration Play

Sickle cell disease in the offspring Whiteboard exercise Play

Significance of cell specialization Student activity Play