Question 1

An enzyme raises the activation energy of the reaction it catalyzes. 
__________________

Accepted Answer

Enzymes lower the activation energy of the reaction they catalyze, making it easier for the reaction to occur.

Question 2

An enzyme binds its substrate at the active site . 
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Accepted Answer

The active site of an enzyme is the specific region where the substrate binds, allowing the enzyme to catalyze a chemical reaction.

Question 3

It is a fact that enzymes are highly specific and will only catalyze one or a few reactions. Can you think of a benefit that is derived from such specificity? (i.e., What would happen if most biochemical reactions were catalyzed by the same enzyme?)

Accepted Answer

The answer of It is a fact that enzymes are...

Question 4

A cell must expend energy to produce a concentration gradient. 
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Accepted Answer

Cells use energy to move molecules against their concentration gradient, from areas of low concentration to areas of high concentration. This process is called active transport and requires ATP as an energy source.

Question 5

The cell maintains a ratio of ATP to ADP that is at the equilibrium point. 
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Accepted Answer

The cell maintains a higher ratio of ATP to ADP to drive cellular processes that require energy; it is not at equilibrium. ATP acts as a readily available energy source, whereas ADP is the lower-energy product that gets recycled back into ATP through cellular respiration processes.

Question 6

In competitive inhibition, the inhibitor binds to the enzyme at the allosteric site. 
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Accepted Answer

In competitive inhibition, the inhibitor binds to the active site of the enzyme, not the allosteric site.

Question 7

A(n) exergonic reaction results in a net gain of free energy. 
__________________

Accepted Answer

An exergonic reaction results in a net release of free energy, not a gain.

Question 8

Most vitamins are coenzymes . 
__________________

Accepted Answer

Most vitamins, such as B-complex vitamins, act as coenzymes in various metabolic reactions in the body.

Question 9

ATP is a type of nucleotide . 
__________________

Accepted Answer

ATP (adenosine triphosphate) is a nucleotide composed of adenine, ribose sugar, and three phosphate groups.

Question 10

How is it possible for an enzyme to lower the required energy of activation for a reaction?

Accepted Answer

The answer of How is it possible for an enzyme...

Question 11

Living cells maintain biochemical reactions far from equilibrium conditions. They do this by constantly manipulating the concentrations of reactants and products. Why is it important that a state far from equilibrium be maintained?

Accepted Answer

The answer of Living cells maintain biochemical reactions far from...

Question 12

At a constant temperature and pH, the rate of an enzymatically catalyzed reaction is inversely proportional to the enzyme concentration. 
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Accepted Answer

At a constant temperature and pH, the rate of an enzymatically catalyzed reaction typically increases with the enzyme concentration, as more enzyme molecules are available to catalyze the reaction.

Question 13

FAD becomes oxidized when it accepts hydrogen atoms and their electrons. 
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Accepted Answer

FAD becomes reduced, not oxidized, when it accepts hydrogen atoms and their electrons.

Quiz 7: Energy and Metabolism

An enzyme raises the activation energy of the reaction it catalyzes. __________________

An enzyme binds its substrate at the active site . __________________

It is a fact that enzymes are highly specific and will only catalyze one or a few reactions. Can you think of a benefit that is derived from such specificity? (i.e., What would happen if most biochemical reactions were catalyzed by the same enzyme?)

A cell must expend energy to produce a concentration gradient. __________________

The cell maintains a ratio of ATP to ADP that is at the equilibrium point. __________________

In competitive inhibition, the inhibitor binds to the enzyme at the allosteric site. __________________

A(n) exergonic reaction results in a net gain of free energy. __________________

Most vitamins are coenzymes . __________________

ATP is a type of nucleotide . __________________

How is it possible for an enzyme to lower the required energy of activation for a reaction?

Living cells maintain biochemical reactions far from equilibrium conditions. They do this by constantly manipulating the concentrations of reactants and products. Why is it important that a state far from equilibrium be maintained?

At a constant temperature and pH, the rate of an enzymatically catalyzed reaction is inversely proportional to the enzyme concentration. __________________

FAD becomes oxidized when it accepts hydrogen atoms and their electrons. __________________