AP Biology (Mader), 11th Edition

Chapter 6: Metabolism: Energy and Enzymes

Post-Test

1
Which of the following is an example of potential energy?
A)A big piece of chocolate cake
B)Someone running a marathon
C)A fish swimming upstream
D)A leaf unfolding
2
Which of the following statements about energy is FALSE?
A)Energy can't be created and it can't be destroyed.
B)Chemical energy in our food can be transformed into energy needed for muscle contractions.
C)When energy is transformed, all of it is available to do work.
D)A battery you just bought at the store has potential energy.
3
Reactions which require an input of energy ___________.
A)are exergonic
B)are endergonic
C)will never occur
4
In the reaction A + B --> C + D, the reactant(s) is/are ______________.
A)only A
B)A and B
C)only D
D)C + D
5
Enzymes _____.
A)slow down chemical reactions
B)increase the energy of activation
C)bring together specific molecules and causes them to react with each other
D)are altered during the course of a reaction
6
Which of the statements about this metabolic pathway is NOT true?
A → B → C → D
A)The endproduct of this metabolic pathway is E.
B)There are five different chemical reactions in this pathway.
C)B is both a reactant and a product.
D)Anyone one of the molecules (A → E) could be a reactant in another pathway.
7
The coenzyme ____ accepts electrons, and is therefore reduced, during cellular respiration.
A)NAD+
B)ATP
C)niacin
D)NADP+
8
During cellular respiration, glucose loses electrons and hydrogen ions and is therefore _____.
A)oxidized
B)reduced
C)phagocytized
9
In the reaction (NADP+ + 2e- + H+ --> NADPH) NADP+ is _____.
A)oxidized
B)reduced
C)phosphorylated
10
The speed of a reaction that involves an enzyme increases as ______.
A)temperatures fall below the optimal temperature
B)pH becomes less than optimal
C)substrate concentration increases
D)enzyme concentration decreases
11
All of the following statements about denaturation are true EXCEPT?
A)Denaturation changes the shape of an enzyme.
B)Denaturation prevents the enzyme from binding its substrate molecules efficiently.
C)Denaturation occurs at temperatures above a certain point.
D)Denaturation increases the rate of reaction.
12
RNA molecules that serve as biological catalysts are:
A)ribozymes
B)ATP synthases
C)nucleotides
D)cofactors
13
In competitive inhibition:
A)product will form when the inhibitor is in the allosteric site.
B)the substrate and the an inhibitor compete for the active site.
C)the inhibitor binds to the enzyme at an allosteric site.
D)binding at the allosteric site increases encourages product formation.
14
The nitrogen base in ATP is _____________.
A)guanine
B)thymine
C)uracil
D)adenine
15
All of the following are cofactors that participate in chemical reactions EXCEPT?
A)Coenzyme NAD
B)Copper
C)Iron
D)Sunlight
16
The first law of thermodynamics states that:
A)Some usable energy is lost as energy is changed from one form to another.
B)The amount of entropy in the universe is decreasing.
C)Energy cannot be created or destroyed, but can be changed from one form to another.
D)The amount of energy in the universe is increasing.
17
Electron transport chains are specifically found:
A)in the nucleolus of the nucleus.
B)embedded in the inner membranes of both chloroplasts and mitochondria.
C)in the matrix of the mitochondria.
D)in the smooth and rough endoplasmic reticulum.
18
Without __________ organisms, life as we know it could not exist.
A)photosynthetic
B)carnivorous
C)herbivorous
D)parasitic
19
Enzymes speed up a chemical reaction by:
A)increasing the activation energy and the energy of the product.
B)increasing the concentration of available substrate.
C)increasing the free energy.
D)decreasing the activation energy.
20
All of the following statements about chemiosmosis are true EXCEPT?
A)Electron transport chains establish the electrochemical gradient needed for chemiosmosis to occur.
B)Chemiosmosis takes place in mitochondria, but not chloroplasts.
C)Hydrogen ions flow down their electrochemical gradient through ATP synthase complexes.
D)ATP is produced.
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