bio484

Which term most precisely describes the cellular process of breaking down large molecules into smaller ones?

• metabolism

• catalysis

• catabolism

• anabolism

Some bacteria are metabolically active in hot springs because

• their enzymes function at a high optimal temperature.

• they use molecules other than proteins as a means of catalysis.

• they are able to maintain a cooler internal temperature despite the high temperature of the environment.

• they are able to maintain a cooler internal temperature despite the high temperature of the environment.

In the reaction, A →  B  +  C  + heat,

• there is a net input of energy

• the potential energy of the product is the same as that of the reactant

• the potential energy of the product is greater that that of the reactant

• the potential energy of the products is less than that of the reactant.

What type of reaction breaks the bonds that join the phosphate groups in an ATP molecule?

• hydrolysis

• dehydration synthesis

• anabolic reaction

• dehydration decomposition

Catabolism is to anabolism as ____________ is to ____________.

• work; energy

• entropy; enthalpy

• exergonic; spontaneous

• exergonic; endergonic

Why is ATP an important molecule in metabolism?

• Its hydrolysis provides an input of free energy for exergonic reactions.

• It provides energy coupling between exergonic and endergonic reactions.

• Its terminal phosphate group contains a strong covalent bond that when hydrolyzed releases free energy.

• Its hydrolysis provides an input of free energy for endergonic reactions

Which of the following shows the correct changes in thermodynamic properties for a chemical reaction in which amino acids are linked to form a protein?

• +∆G, +∆H, +∆S

• +∆G, -∆H, +∆S

• +∆G, +∆H, -∆S

• -∆G, +∆H, -∆S

The mechanism in which the end product of a metabolic pathway inhibits an earlier step in the pathway is known as

• metabolic inhibition.

• feedback inhibition.

• reversible inhibition.

• noncooperative inhibition.

What is a nonprotein "helper" of an enzyme molecule called?

• allosteric group

• accessory enzyme

• coenzyme

• enzyme activator

The active site of an enzyme is the region that

• is involved in the catalytic reaction of the enzyme.

• is inhibited by the presence of a coenzyme or a cofactor.

• binds the products of the catalytic reaction.

• binds allosteric regulators of the enzyme.