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Terms in this set (33)
The second law of thermodynamics essentially says
The energy required to destabilize existing chemical bonds is called ______ energy.
Which of the following is uncharacteristic of ATP?
A.) it is formed by attaching a phosphate group to ADP w/ a high energy
B.) In most reactions involving ATP, only the outer, high-energy bond is hydrolized
C.) It's a good long-term energy storage molecule
D.) When dephosphorylated, ATP becomes ADP
Correct Answer: C
If DG is said to be positive, it means..
Products of the reaction contain more energy than the reactants
The most primitive form of metabolism is..
The degeneration of organic molecules w/ the released energy store in ATP
The First Law of Thermodynamics states that energy can be
The universal energy currency for all cells is
lower the activation energy of a reaction
To what category of macromolecules do most enzymes belong?
NAD+ is a(n)
Which of the following is a reduced compound?
Correct Answer: E
In an endergonic reaction,
the reactants contain less free energy than the products
The energy of random molecular motion is called
The energy available to do work in a system is called
The initial steps in breaking down glucose are called
A catalyst will make a reaction
When molecules are reduced they gain
Which of the following statements about enzymes is true?
A) some substrates can make enzymes change shape slightly
B) all enzymes have the same pH optimum
C) the active sites of all enzymes have the same three-dimensional shape
D) all of the above
E) none of the above
Correct answer: A
help facilitate enzyme activity
How much energy is released when one of the high-energy bonds in ATP is broken?
Consider the hypothetical biochemical pathway H -- I -- J-- K-- L. Which step most likely evolved first?
Why do drastic changes in the temperature or pH of a system alter enzyme activity?
a. they change the three-dimensional shape of the enzyme
b. they disrupt hydrogen and ionic bonds in the enzyme
c. they disrupt hydrophobic interactions in the enzyme
d. all of the above
e. none of the above
Correct answer: D
The loss of an electron by a molecule is called
In the chemical equation G = H - TS, the term G stands for
Enzyme B requires Zn2+ in order to catalyze the conversion of substrate X. The zinc is best identified as a(n):
The next two questions refer to the following chemical reaction that is catalyzed by the enzyme malic dehydrogenase: malic acid + NAD+ -----> oxaloacetic acid + NADH + H+ delta G = +7.1 kcal.
Which of the following statements are true of this reaction?
A) Malic acid is reduced to oxaloacetic acid.
B) The bonds within the products are more stable than those within the substrates.
C) The reaction is endergonic.
D) Entropy is increasing.
E) Both b and c, but not a and d.
Correct answer: C
a. is being reduced
b. is a coenzyme
c. is an oxidizing agent
In the malate dehydrogenase reaction given above, NAD+ is a reducing agent.
Which of the following must be true for a reaction to occur spontaneously?
A) delta G must be negative
B) delta H must be negative
C) delta S must be positive
D) delta G must be positive
E) b, c, and d, but not a
Correct answer: a
Continuing with question 5, this reaction would occur spontaneously.
Redox reactions (oxidation-reduction)
involved the loss of electrons termed oxidation
The actions of an enzyme can be affected by all of the following except
Which of the following are mismatched
a. anabolic reactions-expend energy
b. reduction- gain of an electron
c. endergonic reaction- anabolism
d. exergonic reaction- catabolism
e. activation energy- entropy
correct answer: e
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