BCH 361 Ch. 6 TEST QUESTIONS WITH ANSWERS – UPDATED!!
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BCH 361 Ch. 6
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BCH 361 Ch. 6
BCH 361 Ch. 6 TEST QUESTIONS WITH ANSWERS – UPDATED!!
Is chymotrypsin specific of nonspecific? - Answer-specific
Describe how chymotrypsin works - Answer-splits the peptide bonds only on the carboxyl side of large hydrophobic residues (W,Y,F,M)
Is Thrombin specific or nonspecific? - Answer...
examples of oxidoreductases - Answer-dehydrogenase, transfer of elections, hydride
example of transferases - Answer-kinases
transferases - Answer-move functional groups btw molecules
hydrolases - Answer-cleave bonds w/ the addition of water
examples of hydrolases - Answer-nucleases, peptidases, proteases, lipases, amylase
lyases - Answer-remove atoms to form double bonds or add atoms to double bonds
examples of lyases - Answer-enolase, fumarase
isomerases - Answer-rearrange atoms w/in a molecule
examples of isomerases - Answer-triose phosphate isomerase (reorganization of
carbons), mutase (move functional group intramolecularly)
ligases - Answer-join 2 molecules at the expense of ATP
examples of ligases - Answer-DNA ligase, DNA polymerases, DNA polyerases
, How are most enzymes named? - Answer-after their substrates and the rxns they
catalyze (both forward and backward); w/ suffix "-ase"
cofactors - Answer-small molecules or ions that some enzymes require for activity
apoenzyme - Answer-w/out the cofactor, inactive enzyme
holoenzyme - Answer-complete, catalytically active enzyme w/ its cofactor
coenzymes - Answer-small organic molecules derived from vitamins
co-substrate - Answer-loosely bound (diffuse in and out)
prosthetic groups - Answer-A tightly or covalently bound coenzyme
Name the enzyme for Zn^2 - Answer-carbonic anhydrase
Name the enzyme for biotin - Answer-pyruvate carboxylase
Name the enzyme for coenzyme A - Answer-acetyl CoA carboxylase
Name the enzyme for nicotinamide adenine dinucleotide (NAD+) - Answer-lactate
dehydrogenase
Name the enzyme for Flavin adenine nucleotide (FAD) - Answer-monoamine oxidase
Name the thiamine pyrophosphate (TPP) - Answer-pyruvate dehydrogenase
How do enzymes speed up the rate of rxns? - Answer-by reducing the transition state
energy but enzymes do not alter the free energy change (Delta G) of rxn
What does the free energy change (Delta G) at a given condition depend on? - Answer-
nature of rxn and the reactants and products' concentrations
If coupling rxn can product more reactant or remove the product of a rxn ... - Answer-the
rxn can be driven forward
If coupled rxn has a large neg delta G ... - Answer-the rxn can be driven forward
transition state - Answer-a molecular form that is no longer substrate but not yet product
What is the energy required for form the transition state from substrate called? -
Answer-activation energy
Enzymes facilitate the formation of transition state by ... - Answer-decreasing activation
energy (minimizing the energy diff of transition state and the substrate)
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