Biology 2015

Sylvia S. Mader, Michael Windelspecht

Chapter 6

Metabolism: Energy and Enzymes - all with Video Answers

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Chapter Questions

Problem 1

The fact that energy transformations increase the amount of entropy is the basis of which of the following?
a. cell theory
b. first law of thermodynamics
c. second law of thermodynamics
d. oxidation-reduction reactions

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Problem 2

The energy stored in the carbon-carbon bonds of glucose is an example of _____ energy.
a. kinetic
b. potential
c. chemical
d. mechanical
e. Both b and c are correct

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Problem 3

During energy transformations, the majority of energy is converted to
a. chemical bonds.
b. heat.
c. ATP.
d. glucose molecules

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Problem 4

Exergonic reactions
a. are spontaneous.
b. have a negative delta G value.
c. release energy.
d. All of these are correct.

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Problem 5

Which of the following is incorrect regarding ATP?
a. It is the energy currency of the cell.
b. It is stable.
c. It is recycled using ADP and inorganic phosphate.
d. Cells keep only small amounts of ATP on hand.

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Problem 6

The sum of all the chemical reactions in a cell is called
a. free energy.
b. entropy.
c. metabolism.
d. oxidation-reduction reactions.

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Problem 7

Which of the following is incorrect regarding the active site of an enzyme?
a. is unique to that enzyme
b. is the part of the enzyme where its substrate can fit
c. can be used over and over again
d. is not affected by environmental factors, such as pH and temperature

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Problem 8

Which of the following environmental conditions may have an influence on enzyme activity?
a. substrate concentration
b. temperature
c. pH
d. All of these are correct.

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Problem 9

In which of the following does an inhibitor bind to an allosteric site on an enzyme?
a. competitive inhibition
b. noncompetitive inhibition
c. redox reactions
d. None of the above are correct.

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Problem 10

Enzymes catalyze chemical reactions by which of the following?
a. lowering the energy of activation in the reaction
b. raising the energy of activation in the reaction
c. increasing entropy
d. increasing the free energy of the products

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Problem 11

The gain of electrons by a molecule is called
a. inhibition.
b. entropy.
c. oxidation.
d. reduction.

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Problem 12

In which of the following processes is carbon dioxide reduced to form carbohydrate?
a. cellular respiration
b. noncompetitive inhibition
c. photosynthesis
d. induced fit model

Nalvi D.

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