ENZYMES QUIZ

decatalyze the oxidation of pyruvic acid to acetyl Co A and CO2

retard the reduction of pyruvic acid to acetyl Co A and CO2

Catalyze the oxidation of pyruvic acid to acetyl Co A and CO2

Catalyze the reduction of pyruvic acid to acetyl Co A and CO2

changing the reaction from a biosynthetic to a catabolic pathway

changing the three-dimensional shape of the molecule

oxidizing the molecules by removing electrons

the input of a small amount of activation energy

all of these

Elastase

Chymotrypsin

Trypsin

a protein designated B

two proteins designated A and B

a protein A and one-subunit a

a protein designated A

Both require water to complete the catalytic cycle

Both show specificity for certain amino acid sequences

Both use nucleophilic attack to hydrolyze the peptide bond

Both forms an acyl-enzyme intermediate

keep the specificity pocket open

function as a proton shuttle

neutralize the charge on the other's side chain

clamp the substrate into the active site

both (a) and (b)

Serine

Asparagine

water

Both show specificity for certain amino acid sequences

All of these

Both require water to complete the catalytic cycle

Both use a base to activate the nucleophile

hydrophilic specificity pocket

single reactive serine residue

cluster of reactive serine residues

hydrophobic specificity pocket

Enzymes do not alter the overall change in free energy for a reaction

All of these

Enzymes speed up reactions by lowering activation energy

Enzymes are proteins whose three-dimensional form is key to their function