This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain an..
The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas o..
Hormones are chemical messengers produced by specialized glands and they were produced by switching on the genes designe..
Learn how the way genes control and determine every aspect of the body. This lesson uses lac operon as an example. ..
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Lymphocytes are a type of white blood cell capable of producing a specific immune response to unique antigens. In thi..
This tutorial describes the independent assortment of chromosomes and crossing over as important events in meiosis. Read..