Part A: In this reaction _____. |
c) The products have less potential energy than the reactants. |
Part B: In this reaction _____. |
d) heat has been released to the environment. |
The following reaction |
a) exergonic; energy has been released |
A(n) _____ reaction occurs spontaneously. |
d) exergonic; In exergonic reactions the products have less potential energy than the reactants. |
Which of these reactions requires a net input of energy from its surroundings? |
d) endergonic; The products of endergonic reactions have more potential energy than the reactants. |
In cells, what is usually the immediate source of energy for an endergonic reaction? |
c) ATP (adenosine triphosphate); The hydrolysis of ATP provides the energy needed for an endergonic reaction. |
The reaction ADP + P –> ATP is a(n) _____ reaction. |
b) endergonic; Energy has been acquired from the surroundings |
The energy for an endergonic reaction comes from a(n) _____ reaction. |
b) exergonic; The energy released by an exergonic reaction can be used to drive an endergonic reaction. |
What is the fate of the phosphate group that is removed when ATP is converted to ADP? |
b) It is acquired by a reactant in an endergonic reaction.; By acquiring the phosphate group the reactant acquires energy. |
This graph illustrates a(n) _____ reaction. |
5) endergonic; The products contain more potential energy than the reactants. |
Select the INCORRECT association. |
d) exergonic…uphill; exergonic reactions release energy. |
What is energy coupling? |
e) the use of energy released from an exergonic reaction to drive an endergonic reaction |
Rank these by reaction rate, as measured by the rate of product formation per unit time, from lowest reaction rate to highest reaction rate. |
Order: Uncatalyzed, Enzyme A, Enzyme B *Enzymes lower the activation energy of a chemical reaction. This means that a catalyzed reaction is more likely to proceed than an uncatalyzed reaction, and it forms products more rapidly than an uncatalyzed reaction. |
An enzyme is _______ when it loses its native conformation and its biological activity. A. Active site |
D. Denatured |
An enzyme is considered a _______ because it speeds up chemical reactions without being used up. A. Active site |
C. Catalyst |
An enzyme is considered _______ because of its ability to recognize the shape of a particular molecule. A. Active site |
G. Specific |
A _____, such as a vitamin, binds to an enzyme and plays a role in catalysis. A. Active site |
B. Cofactor |
When properly aligned, the enzyme and subtrate form an enzyme-subtrate (ES) _____. A. Active site |
F. Complex |
A subtrate binds to an enzyme at the _____, where the reaction occurs. A. Active site |
A. Active site |
In a catalyzed reaction a reactant is often called a _____. A. Active site |
E. Subtrate |
If all of the above are correct: |
A substrate binds at an enzyme’s active site; the enzyme typically recognizes the specific shape of its substrate. A cofactor, such as an inorganic ion or vitamin, may bind to the enzyme and assist in catalyzing the reaction. The reaction environment must be appropriate for catalysis to proceed. An enzyme will denature, or change its shape and lose its biological activity, at too high a temperature or at a pH outside the enzyme’s optimal range. |
https://session.masteringbiology.com/problemAsset/1070895/5/T-1041905-enzymes.jpg Which of the following statements is most likely to be true in the case of the feedback-regulated enzymatic pathway shown? |
c) P4 binds E1 and deactivates it.; many enzymatic pathways are regulated by the feedback inhibition model described here. In fact, it is so common that another name for it is end-product inhibition. |
Mastering Biology HW Chapter 8
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