Christina Marshall
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Quiz on Bio 110 Final: Chapter 6, created by Christina Marshall on 13/12/2017.

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Christina Marshall
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Bio 110 Final: Chapter 6

Question 1 of 10

1

Reactions that release free energy are

Select one of the following:

  • exergonic

  • spontaneous

  • endergonic

  • endothermic

  • both a and b

Explanation

Question 2 of 10

1

Enzymes speed up reactions by

Select one of the following:

  • 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

Explanation

Question 3 of 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?

Select one of the following:

  • 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

Explanation

Question 4 of 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

Select one of the following:

  • exergonic

  • endergonic

  • catalyzed by an enzyme

  • catalyzed by a ribozyme

  • Both b an dc are true of this reaction

Explanation

Question 5 of 10

1

In biological systems, ATP functions by

Select one of the following:

  • 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

Explanation

Question 6 of 10

1

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

Select one of the following:

  • reduced

  • phosphorylated

  • oxidized

  • decarboxylated

  • methylated

Explanation

Question 7 of 10

1

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

Select one of the following:

  • 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

Explanation

Question 8 of 10

1

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

Select one of the following:

  • 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

Explanation

Question 9 of 10

1

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

Select one of the following:

  • 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

Explanation

Question 10 of 10

1

Autophagy provides a way for cells to

Select one of the following:

  • 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

Explanation

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