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End of Chapter Quiz
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1
The ability to do work is the definition for
A)thermodynamics.
B)radiation.
C)energy.
D)entropy.
2
The first law of thermodynamics
A)says that energy recycles constantly, as organisms use and reuse it.
B)is concerned with how heat energy can be used to do work.
C)is a formula for measuring entropy.
D)says that energy can change forms, but cannot be made or destroyed.
3
The second law of thermodynamics
A)says that energy recycles constantly, as organisms use and reuse it.
B)says that entropy, or disorder, continually increases in a closed system.
C)is a formula for measuring entropy.
D)says that energy can change forms, but cannot be made or destroyed.
4
Chemical reactions that occur spontaneously are called
A)exergonic and release energy
B)exergonic and require energy
C)endogonic and release energy
D)endergonic and require energy
5
The catalysts that help an organism carry out needed chemical reactions are called
A)hormones.
B)enzymes.
C)reactants.
D)substrates.
6
Factors that affect the activity of an enzyme molecule include
A)peptides and energy.
B)substrates and reactants.
C)temperature and pH.
D)entropy and thermodynamics.
7
In order for an enzyme to work properly
A)it must have a particular shape.
B)the temperature must be within certain limits.
C)the pH must be within certain limits.
D)all of the above are true.
8
One way that a cell can stop an enzyme from working when the cell does not need more of the product is that
A)the cell changes its internal temperature to denature the enzyme.
B)the cell changes its internal pH to inhibit enzyme activity.
C)the cell changes its shape to inhibit enzyme activity.
D)the cell produces repressor molecules that alter the enzyme shape.
9
In competitive inhibition
A)an enzyme molecule has to compete with other enzyme molecules for the necessary substrate.
B)an enzyme molecule has to compete with other enzyme molecules for the necessary energy.
C)an inhibitor molecule competes with the substrate for the same binding site on the enzyme.
D)two different substrates compete for the same binding site on the enzyme.
10
The source of immediate, or "ready cash" energy in the body is
A)ATP molecules.
B)DNA molecules.
C)enzyme molecules.
D)product molecules.





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