Ch 6 Energy & Enzyme Quiz

11 Questions | By Rnreda | Updated: Mar 22, 2022 | Attempts: 2504

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Enzymes are not consumed in a reaction, but they are catalysts that allow the reaction to proceed at a faster rate. This therefore means they produce energy needed for a reaction. Take up the quiz below and test your understanding of chapter Ch. 6 on energy & Enzymes. All the best!

Questions and Answers

1.

Endergonic reactions
- A.
  
  Are always coupling reactions.
- B.
  
  Have a negative DG and occur spontaneously.
- C.
  
  Can only occur if there is an input of energy.
- D.
  
  Have products with less free energy than the reactants.
- E.
  
  All of the above are correct.
2.

Coupling occurs when the energy released by an exergonic reaction is
- A.
  
  Used to drive another exergonic reaction.
- B.
  
  Used to drive an endergonic reaction.
- C.
  
  Lost as nonusable heat to the environment.
- D.
  
  Used to decrease the entropy of the universe.
- E.
  
  All of the above are correct.
3.

Which of the following is characteristic of enzymes?
- A.
  
  They lower the energy of activation of a reaction by binding the substrate.
- B.
  
  They raise the energy of activation of a reaction by binding the substrate.
- C.
  
  They lower the amount of energy present in the substrate.
- D.
  
  They raise the amount of energy present in the substrate.
4.

An enzyme is generally named by adding _____ to the end of the name of the ______.
- A.
  
  "-ose," cell in which it is found
- B.
  
  "-ase," cell in which it is found
- C.
  
  "-ose," substrate
- D.
  
  "-ase," substrate
- E.
  
  "-ase," coenzyme
5.

Which statement describes the currently accepted theory of how an enzyme and its substrate fit together?
- A.
  
  As the product is released, the enzyme breaks down.
- B.
  
  The enzyme is like a key that fits into the substrate, which is like a lock.
- C.
  
  The active site is permanently changed by its interaction with the substrate.
- D.
  
  As the substrate binds to the enzyme, the shape of the active site changes to accommodate the reaction.
6.

A coenzyme is
- A.
  
  An ionic cofactor that interacts with an enzyme to allow it to work.
- B.
  
  A protein cofactor that interacts with an enzyme to allow it to work.
- C.
  
  A nonprotein organic cofactor that interacts with an enzyme to allow it to work.
- D.
  
  An ionic cofactor that interacts with an enzyme to inhibit it.
- E.
  
  A protein cofactor that interacts with an enzyme to inhibit it.
7.

Which organelles contain functioning ATP synthetase complexes in their membranes?
- A.
  
  Golgi complexes and lysosomes
- B.
  
  Mitochondria and chloroplasts
- C.
  
  Endoplasmic reticulum and vesicles
- D.
  
  Vacuoles and vesicles
- E.
  
  Mitochondria and endoplasmic reticulum
8.

Since energy is completely used up by a cell, the cell requires more energy to enter it in the form of food.
- A.
  
  True
- B.
  
  False
9.

All organisms produce heat during their metabolic processes.
- A.
  
  True
- B.
  
  False
10.

The ultimate source of nearly all the energy that is used to support life is sunlight.
- A.
  
  True
- B.
  
  False
11.

The energy of activation is the energy that must be supplied so that molecules are able to interact with each other in a chemical reaction.
- A.
  
  True
- B.
  
  False