ENZYMES QUIZ

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

Enzymes speed up reactions by lowering activation energy

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

All of these

40 kJ/mol

88 kJ/mol

58 kJ/mol

49 kJ/mol

Both forms an acyl-enzyme intermediate

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

hydrophobic specificity pocket

cluster of reactive serine residues

hydrophilic specificity pocket

single reactive serine residue

neutralize the charge on the other's side chain

clamp the substrate into the active site

function as a proton shuttle

keep the specificity pocket open

a protein designated B

two proteins designated A and B

a protein designated A

a protein A and one-subunit a

A, B, C, and D will all still be produced

A, B, and C will still be produced, but not D

A will still be produced, but not B, C, or D

A and B will still be produced, but not C or D

Both require water to complete the catalytic cycle

All of these

Both use a base to activate the nucleophile

Both show specificity for certain amino acid sequences

size, shape, and charge of the active site or specificity pocket

absence of water in the active site

presence of a low-barrier hydrogen bond in the active site or specificity pocket

proximity of Ser 195 to the active site or specificity pocket

It catalyzes the production of hormones that maintain the stomach lining

It is critical for the biosynthesis of DNA

It helps to transport carbon dioxide in the blood

It is a chemical derivative of aspirin