7.01SC Fundamentals of Biology (Fall 2011, MIT OCW). Instructors: Prof. Eric Lander, Prof. Graham Walker, Prof. Sallie Chisholm, et al. This consists of a series of video lectures given by Prof. Eric Lander, Prof. Robert Weinberg, Prof. Tyler Jacks, et al.. This course focuses on the basic principles of biochemistry, molecular biology, genetics, and recombinant DNA. These principles are necessary to understanding the basic mechanisms of life and anchor the biological knowledge that is required to understand many of the challenges in everyday life, from human health and disease to loss of biodiversity and environmental quality.
(from ocw.mit.edu)
Lecture 12 - Part 1: Gene Regulation
References
Lecture 12 - Gene Regulation and the Lac Operon
Cells with the same DNA can look and function differently from each other; consider a photoreceptor cell and muscle cell. The difference between these two cells is the result of differential gene expression.