"Physiological pH", the pH for optimum activity for most enzymes, is a pH equal to
"Physiological conditions" for reactions within the body are approximately
A)pH 3 and 37 °C.
B)pH 7 and 37 °C.
C)pH 7 and 37 °F.
D)pH 8 and 273 °C.
E)pH 7 and 273 K.
Most enzymes are deactivated permanently above a temperature of about
The surface of a freshly cut apple turns brown because of
A)inhibition of the surface enzymes by nitrogen.
B)interaction of the surface enzymes with oxygen.
C)a change in pH at the surface.
D)an increase in substrate concentration at the cut surface.
E)the presence of vitamin C in the apple.