Cold Spring Harbor Laboratory
Dna From the Beginning: Genes Can Be Turned on and Off
Two French scientists describe the research they did to figure out how bacteria turn certain genes on and off. The topic is a little involved, but the animations should help you understand the process.
CK-12 Foundation
Ck 12: Gene Regulation in Prokaryotes
[Free Registration/Login may be required to access all resource tools.] Provides an overview of gene regulation in prokaryotic cells while defining operon, explaining the roles of the operator, the promoter, and the repressor, and...
US Department of Labor
Bureau of Labor Statistics: Masonry Workers
This resource provides information about masonry workers.
That Quiz
That Quiz: Comparar
These interactive activities are designed to compare different expressions involving addition, subtraction, multiplication and division.