ADP is the abbreviation for adenosine 5'-diphosphate, a molecule involved in energy transfer within cells and with regulation of clot formation in the blood. It consists of an adenine ring, a ribose sugar and two phosphate groups.Know More
Adenosine 5'-diphosphate is formed when adenosine 5'-triphosphate (ATP) is hydrolyzed to form ADP plus a free phosphate group. This is a spontaneous or exergonic reaction which releases energy that the cell then uses to drive nonspontaneous reactions.
ADP also plays an important role in hemostasis, the normal process of blood coagulation to stop bleeding when an injury occurs. Platelets in the blood will stick to the walls of blood vessels when a vessel is injured. The platelets then release several chemicals — including ADP — to regulate the coagulation process. ADP causes additional platelets in the blood to change shape and stick aggressively to the growing clot, increasing its size and strength. ADP also induces fibrinogen fibers to stick to and reinforce the clot.Learn more about Cells
Red blood cells do not have mitochondria. In fact, the cytoplasm of a mature, mammalian red blood cell has no organelles at all, not even a nucleus.Full Answer >
Cellular reproduction requires a nucleus and a mitochondria in order to perform mitosis, the process of cell division. Mature red blood cells do not contain a nucleus or mitochondria, making mitosis impossible.Full Answer >
White blood cells have a nucleus, but red blood cells do not. White blood cells play protect the body from disease and infection.Full Answer >
According to Arizona State University, Robert Hooke used the term "cells" in reference to small biological organisms because their structure reminded him of monks' rooms or "cells." The term stuck, and these organisms are still referred to as cells today.Full Answer >