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.
At what RPM should the car idle at? #1 Suge_Mike. I was curious at what RPM the car should idle at when im at a stop light or stop sign in drive, with my foot on the break? it seems to have dropped a little in the past couple of days. at first it seemed to be at around 800 now its right at 500. is this normal? -Mike.