Question 1

Biosynthetic reactions require many things, including

Accepted Answer

A)  carbon dioxide and water. 
B)  glucose and water. 
C)  enzymes and ATP. 
D)  sunlight and CTP.

Question 2

In the reaction H₂O + CO₂ + carbonic anhydrase→ HCO₃- + H⁺+ carbonic anhydrase, carbonic anhydrase is a(n)

Accepted Answer

A)  reactant. 
B)  product. 
C)  enzyme. 
D)  active site.

Question 3

Which of the following strategies is not used by cells to help enzymes and substrates find each other?

Accepted Answer

A)  locating enzymes used in the same biochemical pathway near each other in the cytoplasm 
B)  having certain reactions occur within a specific organelle 
C)  embedding more enzymes in the plasma membrane 
D)  producing heat to increase the frequency of molecular collisions

Question 4

Oxygen can be reduced.

Accepted Answer

A) True 
 B)False

Question 5

Some kinds of drain cleaners use enzymes rather than strong, more dangerous chemicals. These enzymes must be able to

Accepted Answer

A)  catalyze a catabolic reaction. 
B)  raise the activation energy of the reaction that clears the clog. 
C)  create energy that can be used to break up the clog. 
D)  allow excess heat to be passed off into the environment.

Question 6

Plants and animals use different energy storage molecules, yet they both use the same mechanism to "burn" their stored energy. How can plants and animals both be successful, even though they "burn" different energy storage molecules?

Accepted Answer

A)  The internal components of plant and animal cells are identical. 
B)  The second law of thermodynamics says that all cells have the same energy transfer system. 
C)  The breaking of the chemical bonds of a storage molecule transfers energy, no matter what molecule is stored. 
D)  All organisms have the same enzymes to catalyze their energy-producing reactions.

Question 7

This graph depicts the amount of energy involved over the course of a chemical reaction. 
The graph indicates that

Accepted Answer

A)  the products of this reaction have more energy that the substrates. 
B)  this reaction requires an input of energy to convert glucose and O₂ to H₂O and CO₂. 
C)  this reaction can only run in one direction (from left to right on the graph). 
D)  this reaction only occurs in the presence of an enzyme.

Question 8

In a human cell,

Accepted Answer

A)  one enzyme usually catalyzes no more than five different chemical reactions. 
B)  nearly all chemical reactions are catalyzed by enzymes. 
C)  enzymes have to be constantly replaced as they are used up in the reactions that they catalyze. 
D)  some enzymes are specialized to store activation energy.

Exam 7: Energy and Enzymes