Enzymes Lecture Quiz

Greek word for yeast

• en

• zyne

• zyme

• in

Tightly bound cofactor to the apoenzyme

• Conjugated enzyme

• Apoenzyme

• Prosthetic group

• Holoenzyme

The enzyme lacking an essential cofactor in order to be activated

• Holoenzyme

• Conjugated enzyme

• Metalloenzyme

• Apoenzyme

The reactant in an enzyme catalyzed reaction

• Substrate

• Product

• Apoenzyme

• Metalloenzyme

All proteins are enzymes EXCEPT for:

• Oxidase

• Hydrolase

• Ribozyme

• Apoenzyme

The following are true about enzymes, EXCEPT

• Saturable

• Consumable

• Increases reaction rate by lowering activation energy

• Bond formation of substrate and enzyme happens at the binding site

Which of the following is true concerning the induced fit model of enzyme catalysis?

• The active site can be influenced by molecules binding elsewhere on an enzyme

• The induced fit must occur prior to the initial binding of enzyme and substrate in order for the reaction to proceed

• The initial binding of enzyme and substrate is the most tightly bound conformation

• The binding of enzyme and substrate is weakest in the transition stat

Which of the following enzyme classes catalyze reactions in which two molecules are covalently connected to each other?

• Kinase

• Lyase

• Isomerase

• Ligase

S-Adenosyl methionine (SAM) is a molecule utilized in various metabolic pathways to transfer methyl groups from SAM to an acceptor. What is the proper designation of the complex of SAM and its enzyme together?

• Prosthetic group

• Coenzyme

• Holoenzyme

• Cofactor

This is the nonprotein part of the conjugated enzyme. It is generally either a small organic molecule or an inorganic ion.

• Cofactor

• Prosthetic group

• Coenzyme

• Apoenzyme