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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.


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