ENERGY Practice Questions:
1.
Water held back by a dam represents what kind of energy?
A.
Hydroelectric
B.
Irrigation
C.
Potential
D.
Kinetic
E.
At times, all of the above
2.
The standard free energy change for the hydrolysis of ATP to ADP + Pi is –7.3 kcal/mol. What can you conclude from this information?
The reaction will never reach equilibrium.
The free energy of ADP and phosphate is higher than the free energy of ATP.
The reaction requires energy.
The reaction is endergonic.
The reaction is exergonic.
3.
The hydrolysis of maltose to glucose is an exergonic reaction. Which of the following statements is true?
The reaction requires the input of free energy.
The free energy of glucose is larger than the free energy of maltose.
The reaction is not spontaneous.
The reaction releases free energy.
At equilibrium, the concentration of maltose is higher than the concentration of glucose.
4.
The first law of thermodynamics states that the total energy in the universe is
decreasing.
increasing.
constant.
being converted to free energy.
being converted to matter.
5.
When an enzyme catalyzes both an exergonic reaction and an endergonic reaction, the two reactions are said to be
substrates.
endergonic.
kinetic.
activated.
coupled.
6.
How does a noncompetitive inhibitor inhibit binding of a substrate to an enzyme?
It binds to the substrate.
It binds to the active site.
It lowers the activation energy.
It increases the DG of the reaction.
It changes the shape of the active site.
7.
Which statement about enzymes is not true?
They act to speed up a biochemical reaction.
They are made up of RNA or protein.
They change the value of DG of the reaction.
They are sensitive to heat.
They are sensitive to pH.
8.
Binding of substrate to the active site of an enzyme is
reversible.
irreversible.
noncompetitive.
allosteric.
9.
The molecules that are acted on by an enzyme are called
products.
carriers.
prosthetics.
effectors.
10.
The statement "Enzymes are highly specific" means certain
enzymes are found in certain cells.
reactions involving certain substrates are catalyzed by certain enzymes.
enzymes require certain concentrations of substrates.
reactions with certain activation energies are catalyzed by certain enzymes.
concentrations of substrates work with certain enzymes.
11.
What can never be created or destroyed?
Entropy
Energy
Free energy
Thermal energy
Potential energy
12.
The overall reaction: glucose + O2 ® CO2 + H2O + energy
cannot occur without an enzyme.
is endergonic.
is exergonic.
occurs in a single step in cells.
transforms the glucose to a higher energy state.