Friday, October 22, 2010

Enzymes



Enzymes are proteins that catalyze (i.e., increase or decrease the rates of)chemical reactions.In enzymatic reactions, the molecules at the beginning of the process are called substrates, and the enzyme converts them into different molecules, called the products. Almost all processes in a biological cell need enzymes to occur at significant rates. Since enzymes are selective for their substrates and speed up only a few reactions from among many possibilities, the set of enzymes made in a cell determines which metabolic pathways occur in that cell.

Vitamin C

(ascorbic acid) is an antioxidant that is essential for human nutrition.
Vitamin C deficiency can lead to a disease called scurvy, which is
characterized by abnormalities in the bones and teeth. Many fruits
and vegetables contain vitamin C, but cooking destroys the vitamin,
so raw citrus fruits and their juices are the main source of ascorbic acid
for most people.

Friday, October 15, 2010

CHEMISTRY COMPOSED ON MATTER......SO IF THERE IS MATTER.THEN PRINCIPLES OF CHEMISTRY ARE APPLICABLE THERE..........