Many enzymes consist of a protein and a non-protein (called the cofactor). The proteins in enzymes are usually globular. The intra- and intermolecular bonds that hold proteins in their secondary and tertiary structures are disrupted by changes in temperature and pH. This affects shapes and so the catalytic activity of an enzyme is pH and temperature sensitive.
Everyday in the U.S. millions of cars and trucks idle needlessly, sometimes for hours. You may not be able to avoid keeping your engine running when youâre stopped at a traffic signal or stuck in slow-moving traffic. But other times idling is unnecessary. An idling car can release as much pollution as a moving car.
Some run for 30 minutes, and are off for 30 minutes, some run for two hours and are off for two hours. Of course, your running times will CERTAINLY vary if you open the doors, but overnight, when the doors are closed, or if you dont open the doors for several hours, your run/idle times should be at or very near equal.