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.
In order to recharge your car battery while driving you will need to operate the vehicle over 1,000 RPMâs for a sustained period of time. The longer the battery has been dead, the longer it will take to fully recharge it. However, by driving for at least a half an hour at 1,000 RPMâs, you should charge your battery enough that you will be able to restart the vehicle once you turn it off. Driving for an hour, without using the lights, radio or other electrical devices, should fully charge your battery.