(Science: botany) a change in the character of a cell wall, by which it becomes harder. It is supposed to be due to an incrustation of lignin. Origin: cf. F. Lignification. See lignify. The depositing of lignin in cell walls by plants that creates wood...
Control of Growth & Development tutorials look at how the genetic makeup determines the biological processes on a da..
It only takes one biological cell to create an organism. A single cell is able to keep itself functional through its 'mi..
Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..
Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..
Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..
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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