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.
I have a question about my idle or rpms staying high after rideing around and maintaining the same speed for a while. As an example, it happens quite a bit when I get off the fwy having rode for about 15-20 minutes at high fwy speeds. I get off the off ramp, down shifting like I normally do to a stop and the idle in 1st gear at stop stays very high, as if the throttle is stuck.