Summary. Enzymes are catalysts that, within the mild conditions of temperature, pH, and pressure of the cells, carry out chemical reactions at amazing high rate. They are characterized by a remarkable efficiency and specificity. Substrates are the substances on which enzymes act.
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Emperor penguins have the ability to 'recycle' their own body heat. The arteries and veins lie close together so that blood is pre-cooled on the way to a penguin's feet, wings and bill and warmed on the way back to the heart. Emperors' feet are adapted to the icy conditions
- The
storm must be developing over warm water. The water must be at least 80
degrees Fahrenheit. The warm water provides the energy for increased
evaporation of water from the ocean surface.
- The
warm water must be at least 200 feet deep
<span>- There
should be very little wind shear in the area. Wind shear occurs when there is a
difference in wind speed and direction over a short distance. Strong wind shear
can stop the formation of hurricane eye walls. </span>
