Intro to metabolism

Which of the following types of reactions would decrease the entropy within a cell?

A. anabolic reactions

Which of the following is a statement of the first law of thermodynamics?

A. energy cannot be created or destroyed

Energy that is associated with the relative motion of an object is called ______ energy.

A. kinetic

Which of the following statements is true about enzyme-catalyzed reactions?

A. the reaction is faster than the same reaction in the absence of the enzyme

Reactants capable of interacting to form products in a chemical reaction must first overcome a thermodynamic barrier known as the reaction's ________.

B. activation energy

Many enzymes require assistance for catalyzing a reaction. What is the correct term for a nonprotein molecule that is required for the proper functioning of an enzyme?

B. cofactor

Which of the following statements regarding enzymes is true?

B. enzymes increase the rate of a reaction by lowering the activation energy barrier

Choose the pair of terms that correctly completes this sentence: Catabolism is to anabolism as _____ is to _____.

B. exergonic; endergonic

The mechanism in which the end product of a metabolic pathway inhibits an earlier step in the pathway is most precisely described as .

B. feedback inhibitions

Which of the following is true for all exergonic reactions?

B. the reaction proceeds with a net release of energy

The reactant an enzyme acts on is referred to as the ____.

C. substrate

Which of the following statements does not describe the effect of temperature on enzyme activity?

C. there is no relationship between enzyme activity and temperature

Which of the following is true for anabolic pathways?

C. they consume energy to build up polymers from monomers

Which of the following is not a type of work performed by a cell?

D. all of the above

How does a noncompetitive inhibitor decrease the rate of an enzyme reaction?

D. by changing the shape of the enzyme's active site

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

D. catabolism

Whenever energy is transformed, there is always an increase in the ______.

D. entropy of the universe

Which of the following is true of metabolism in its entirety in all organisms?

D. metabolism consists of all the energy transformation reactions in an organism

Which of the following is an example of potential energy?

D. water behind a dam

What molecule releases energy when its phosphate bonds are hydrolyzed?

D. ATP