The key catalytic amino acids of the chymotrypsin active site in the free enzyme are: A. a serine, an aspartic acid with a deprotonated side chain and a histidine with a protonated side chain. B. a serine, an aspartic acid with a deprotonated side chain and a histidine with a deprotonated side chain. C. a serine, an aspartic acid with a protonated side chain and a histidine with a protonated side chain. D. a serine, an aspartic acid with a protonated side chain and a histidine with a deprotonated side chain. E. a serine, an aspartic acid, and a histidine; each of which has a deprotonated side chain.

Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas.in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

Which formula can be used to calculate the molar mass of hydrogen peroxide