Christina Marshall
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Quiz am Bio 110 Final: Chapter 6, erstellt von Christina Marshall am 13/12/2017.

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Christina Marshall
Erstellt von Christina Marshall vor etwa 7 Jahre
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Bio 110 Final: Chapter 6

Frage 1 von 10

1

Reactions that release free energy are

Wähle eine der folgenden:

  • exergonic

  • spontaneous

  • endergonic

  • endothermic

  • both a and b

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Frage 2 von 10

1

Enzymes speed up reactions by

Wähle eine der folgenden:

  • providing chemical energy to fuel a reaction

  • lowering the activation energy necessary to initiate the reaction

  • causing an endergonic reaction to become an exergonic reaction

  • substituting one of the reactants necessary for the reaction

  • none of the above

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Frage 3 von 10

1

For the idealized reaction aA + bB === cC + dD, suppose that the equilibrium constant Keq, is 0.01. If the starting concentration for A,B,C, and D are 1 M each, what would you predict will happen based on the value of Keq?

Wähle eine der folgenden:

  • The forward reaction is favored

  • The reverse reaction is favored

  • The forward reaction is fast

  • The reverse reaction is fast

  • Both b and d are correct

Erklärung

Frage 4 von 10

1

Researchers analyzed a cell extract-- a mixture of molecules isolated from cells-- and studied a chemical reaction in which a carbohydrate was broken down into smaller molecules. When they added a protease to the cell extract, the discovered that the protease greatly inhibited the rate of the reaction. Based on this observation, you could conclude that the reaction is

Wähle eine der folgenden:

  • exergonic

  • endergonic

  • catalyzed by an enzyme

  • catalyzed by a ribozyme

  • Both b an dc are true of this reaction

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Frage 5 von 10

1

In biological systems, ATP functions by

Wähle eine der folgenden:

  • providing the energy to drive endergonic reactions

  • acting as an enzyme and lowering the activation energy of certain reactions

  • adjusting the pH of solutions to maintain optimal conditions for enzyme activity

  • regulating the speed at which endergonic reactions proceed

  • interacting with enzymes as a cofactor to stimulate chemical reactions

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Frage 6 von 10

1

In a chemical reaction, NADH is converted to NAD+ plus H+. W easy that NADH has been

Wähle eine der folgenden:

  • reduced

  • phosphorylated

  • oxidized

  • decarboxylated

  • methylated

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Frage 7 von 10

1

Currently, scientists are identifying proteins that use ATP as an energy source by

Wähle eine der folgenden:

  • determining whether those proteins function in anabolic or catabolic reactions

  • determine is the protein has a known ATP-binding site

  • predicting the free energy necessary for the protein to function

  • determining if the protein has an ATP synthase subunit

  • all of the above

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Frage 8 von 10

1

For a particular chemical reaction, an inhibitor raises the Km, but does not affect the Vmax. This inhibitor

Wähle eine der folgenden:

  • is a competitive inhibitor

  • is a noncompetitive inhibitor

  • binds to the active site of the enzyme

  • binds to an allosteric site of the enzyme

  • is a competitive inhibitor and binds to the active site of the enzyme

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Frage 9 von 10

1

Which of the following is (are) key benefits of catabolic reactions?

Wähle eine der folgenden:

  • Recycling of organic building blocks

  • Breakdown of organic molecules to obtain energy

  • Synthesis of important polymers, such as polypeptides

  • All of the above

  • a and b only

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Frage 10 von 10

1

Autophagy provides a way for cells to

Wähle eine der folgenden:

  • degrade entire organelles and cycle their components

  • control the level of ATP

  • engulf bacterial cells

  • export unwanted organelles out of the cell

  • inhibit the first enzyme in a metabolic pathway

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