Mastering Biology Ch.6

Select the highest energy form of adenosine from the following images

Which part of the adenosine triphosphate molecule is released when it is hydrolyzed to provide energy for biological reactions?

A(n) ________ inhibitor has a structure that is so similar to the substrate that it can bond to the enzyme just like the substrate.

A(n) ________ inhibitor binds to a site on the enzyme that is not the active site.

Usually, a(n) ________ inhibitor forms a covalent bond with an amino acid side group within the active site, which prevents the substrate from entering the active site or prevents catalytic activity.

The competitive inhibitor competes with the substrate for the ______ on the enzyme.

When the noncompetitive inhibitor is bonded to the enzyme, the shape of the ______ is distorted.

Enzyme inhibitors disrupt normal interactions between an enzyme and its _______.

You have added an irreversible inhibitor to a sample of enzyme and substrate. At this point, the reaction has stopped completely. What can you do to regain the activity of the enzyme?

You have an enzymatic reaction proceeding at the optimum pH and optimum temperature. You add a competitive inhibitor to the reaction and notice that the reaction slows down. What can you do to speed the reaction up again?

The graph presents three activation energy profiles for a chemical reaction (the hydrolysis of sucrose): an uncatalyzed reaction, and the same reaction catalyzed by two different enzymes. Rank these by reaction rate, as measured by the rate of product formation per unit time, from lowest reaction rate to highest reaction rate. To rank items as equivalent, overlap them.

An enzyme is ______ when it loses its native conformation and its biological activity.

An enzyme is considered a ________ because it speeds up chemical reactions without being used up.

An enzyme is considered _______ because of its ability to recognize the shape of a particular molecule.

A ________, such as a vitamin, binds to an enzyme and plays a role in catalysis.

When properly aligned, the enzyme and substrate form an enzyme-substrate (ES) _______.

A substrate binds to an enzyme at the ______, where the reaction occurs.

In a catalyzed reaction a reactant is often called a _______.

Which of the following statements is most likely to be true in the case of the feedback-regulated enzymatic pathway shown?

In general, enzymes are what kinds of molecules?

Enzymes work by _____.

An enzyme _____.

What name is given to the reactants in an enzymatically catalyzed reaction?

As a result of its involvement in a reaction, an enzyme _____.

What is the correct label for "A"?

Which of the following statements about the combustion of glucose with oxygen to form water and carbon dioxide (C6H12O6 + 6 O2 → 6 CO2 + 6 H2O) is correct?

Which of the following statements about ATP (adenosine triphosphate) is correct?

Enzymes are described as catalysts, which means that they __________.

Which of the following is NOT a way in which an enzyme can speed up the reaction that it catalyzes?

Select the correct statement about chemical energy, a term used by biologists to refer to potential energy available for release in a chemical reaction.

Which of the following statements about the role of ATP in cell metabolism is true?

Which statement about the binding of enzymes and substrates is correct?

Which of the following is true for anabolic pathways?

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

A system at chemical equilibrium

Which of the following is true for all exergonic reactions?

A chemical reaction that has a positive ΔG is best described as

Which of the following statements regarding enzymes is true?

The active site of an enzyme is the region that

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