Kimball's Biology Pages: Cladistics

This is a good page for explaining the development and function of enzymes. It includes links to help with the chemistry and the biology that comes up.

An overview of the nitrogen cycle, covering nitrogen fixation, decay, nitrification, denitrification, and more.

Useful introduction to the carbon cycle with a diagram and a discussion of the effects of carbon dioxide on the greenhouse effect and global warming.

Site from Kimball's Biology Pages provides information on Asexual Reproduction in plants, and also in animals, where it is less common. Includes information on stems, leaves, roots, plant propagation and apomixis.

This site is produced by John W. Kimball, a retired biology teacher who wrote the textbook that these pages came from. The excerpt explains the different parts of the circulation system and how they function. Includes great pictures!

This site, from retired Harvard professor John W. Kimball, provides a detailed but understandable explanation of sexual reproduction in flowering plants. Includes informative, well labelled illustrations.

An online biology textbook page on insect hormones. Full of labeled, color diagrams for better understanding.

Written by a former author of Biology textbooks, this page describes not only color vision, but the anatomy of the eye, and color blindness. Easy to understand language.

An online biology textbook on the structure and function of the kidneys. Full of labeled, color diagrams for better understanding.

This site is a retired biology professor's explanation of restriction enzymes. Good visual showing examples of how enzymes cut DNA to produce blunt or sticky ends.