Turn the control knob in this interactive to change the level of gene expression in a cell. Find out how gene, mRNA, and protein production are linked.

This site from the PBS production, Scientific American Frontier "Never Say Die", includes a section entitled "The Clock of Life". It provides a discussion of cell death through shortening of the telomere. A good class activity included.

Site covers all aspects of plant reproduction such as life cycles, angiosperms and flowers. Provides links to other sites to aide in research.

Provides information and illustrations of the reproduction process in flowers. Learn more about flowers, double fertilization, seeds, fruit and vegetative propagation.