This 18-minute video lesson provides an introduction to bacteria. [Biology playlist: Lesson 18 of 71].

This 17-minute video lesson looks at C-4 Photosynthesis: How some plants avoid photorespiration. [Biology playlist: Lesson 33 of 71].

This 9-minute video lesson looks at how CAM Plants are able to fix carbon at night so they don't have to keep their stomata open during the day. [Biology playlist: Lesson 34 of 71].

This 7-minute video lesson provides a correction to Sodium and Potassium Pump Video. [Biology playlist: Lesson 43 of 71].

This 10-minute video lesson discusses how cytotoxic T-Cells get activated by MHC-I/antigen complexes and then proceed to kill infected cells. [Biology playlist: Lesson 56 of 71].

This 28-minute video lesson provides an introduction to DNA. [Biology playlist: Lesson 6 of 71].

This 19-minute video lesson looks at diffusion and osmosis. [Biology playlist: Lesson 36 of 71].

This 17-minute video lesson presents an overview of the Electron Transport Chain. [Biology playlist: Lesson 26 of 71].

This 2-minute video lesson provides an overview of early development of a zygote to an embryo. It also discusses embryonic and somatic stem cells. [Biology playlist: Lesson 12 of 71].

This 13-minute video lesson provides an overview of glycolysis. [Biology playlist: Lesson 24 of 71].

This 21-minute video lesson provides an introduction to helper T-Cells and their role in activating B cells. [Biology playlist: Lesson 55 of 71].

This 15-minute video lesson examines hemoglobin and its role in the circulatory system. [Biology playlist: Lesson 40 of 71].

This 6-minute vidoe lecture conlcudes the short series on human prehistory. [Biology playlist: Lesson 67 of 71]

This 6-minute video lesson looks at human prehistory and the human migrations from Africa to Asia and other parts of the world. [Biology playlist: Lesson 64 of 71

This 6-minute video looks at human prehistory through the ice age. It discusses the migrations from Asia into North and South America. [Biology playlist: Lesson 65 of 71]

This 7-minute video looks at the introduction of agriculture into human prehistory. [Biology playlist: Lesson 66 of 71]

This 5-minute video lesson introduces this short series on human preshistory. [Biology playlist: Lesson 63 of 71].

This 15-minute video provides an overview of the inflammatory response. [Biology playlist: Lesson 58 of 71].

This 18-minute video lesson provides an overview of the Krebs or Citric Acid Cycle. [Biology playlist: Lesson 25 of 71].

This 10-minute video lesson shows how how myosin and actin interact to produce mechanical force. [Biology playlist: Lesson 47 of 71].