quiz 2 nut
False
. Oxidoreductases always involve transfer of hydrogen onto NAD+.
False.
A competitive inhibitor lowers Km but does not affect Vmax.
False.
A non-competitive inhibitor lowers Km but does not affect Vmax.
False.
Transferases catalyze the transfer of a reactive group from one position to another within a substrate molecule.
The active site of an enzyme consists of both a substrate binding site and a ----- site.
catalytic
True.
An enzyme catalyzes a reaction by decreasing the activation energy.
True .
An enzyme does not affect the position of the equilibrium of the reaction catalyzed.
Nucleus
Contains genetic material
ester and amide
Hydrolases catalyze the cleavage of ---bonds.
False.
If an enzyme requires a coenzyme or prosthetic group, then the enzyme protein alone is known as the holo-enzyme.
enzyme
If the enzyme is saturated with substrate, then the rate of reaction is proportional to the amount of --present.
enzyme
If the enzyme is saturated with substrate, then the rate of reaction is proportional to the amount of---- present.
Cytoplasm
Interior content of cell
single
Isomerases unlike most other enzymes, have only a --- substrate.
True .
Kinases catalyze the transfer of phosphate from ATP onto a substrate.
substrate
Km is concentration of -- required to achieve half Vmax.
true
Km is the substrate concentration at which the enzyme achieve half Vmax.
formation
Ligases catalyze the ---bonds between substrates.
True .
Ligases may catalyze the formation of ester or amide bonds.
Plasma membrane
Outer membrane of eukaryotic cells
oxygen
Oxidoreductases always involve reaction with molecular ----.
True.
Oxidoreductases catalyze oxidation reactions.
Mitochondria
Site of TP molecules
Endoplasmic reticulum
Synthesis, storage and transport of proteins and minerals
catalytic
The active site of an enzyme consists of both a substrate binding site and a ---- site.
amino acids
The active site of an enzyme is made up from the side-chains of ---that may be some distance apart in the primary sequence.
True .
The apo-enzyme is catalytically inactive because certain enzymes require a prosthetic group for the activity.
True .
The effect of a competitive inhibitor can be overcome by increasing the concentration of substrate.
True.
The enzyme is always unchanged at the end of the reaction.
False.
The holo-enzyme is catalytically inactive.
