_1. Which Best describes the first law of thermodynamics?
AEnergy is not created nor destroyed, but it can change into matter.
BEnergy is not created nor destroyed, but it can change from one energy form to another.
CEnergy can be created from matter or used to produce matter.
DSome useful energy is lost as heat whenever an energy transfer occurs.
EEnergy transfers are always 100% efficient in changing energy from one useful form to another.
_____2. Which Best describes the second law of thermodynamics?
AEnergy is not created nor destroyed, but it can change into matter.
BEnergy is not created nor destroyed, but it can change from one energy form to another.
CEnergy can be created from matter or used to produce matter.
DSome useful energy is lost as heat whenever an energy transfer occurs.
EEnergy transfers are always 100% efficient in changing energy from one useful form to another.
_____3. All of the biochemical pathways in a cell constitute
Acoupling reactions
Bfree energy
Cendergonic reactions only
Dexergonic reactions only
Emetabolism
_____4. Coupling occurs when the energy by an exergonic reaction is
Aused to drive another exergonic reaction.
Bused to drive an endergonic reaction.
Clost as nonusable heat to the environment.
Dused to decrease the entropy of the universe.
EAll of the above are correct.
_____5. The subunits from which ATP is made are
AADP and phosphate
BFAD and NAD+
CFAD and NADPH
DADP and FAD
EADP and NAD+
_____6. ATP is considered to be
Aan enzyme used widely in all kinds of cells.
Ba molecule that carries a great deal of chemical energy in a chemical bond.
Ca coenzyme used to inhibit or activate different enzymes.
Dthe precursor of a high energy membrane bounded protein.
____7. Which of the following is characteristic of enzymes?
AThey lower the energy of activation of a reaction by binding the substrate.
BThey raise the energy of activation of a reaction by binding the substrate.
CThey lower the amount of energy present in the substrate.
_____8. Which statement describes the currently accepted theory of how an enzyme and its substrate fit together?
AAs the product is released, the enzyme breaks down.
BThe enzyme is like a key that fits into the substrate, which is like a lock.
CThe active site is permanently changed by its interaction with the substrate.
d)Induced Fit Model- As the substrate binds to the enzyme, the shape of the enzyme site changes to accommodate the reaction.
_____9. Which statement is Not true about the effects of various conditions on the activity of an enzyme?
AHigher temperatures generally increase the activity of an enzyme up to a point.
BAbove a certain range of temperatures, the protein of an enzyme is denatured.
CA change in pH can cause an enzyme to be inactivated.
AEnergy is not created nor destroyed, but it can change into matter.
BEnergy is not created nor destroyed, but it can change from one energy form to another.
CEnergy can be created from matter or used to produce matter.
DSome useful energy is lost as heat whenever an energy transfer occurs.
EEnergy transfers are always 100% efficient in changing energy from one useful form to another.
AEnergy is not created nor destroyed, but it can change into matter.
BEnergy is not created nor destroyed, but it can change from one energy form to another.
CEnergy can be created from matter or used to produce matter.
DSome useful energy is lost as heat whenever an energy transfer occurs.
EEnergy transfers are always 100% efficient in changing energy from one useful form to another.
Acoupling reactions
Bfree energy
Cendergonic reactions only
Dexergonic reactions only
Emetabolism
Aused to drive another exergonic reaction.
Bused to drive an endergonic reaction.
Clost as nonusable heat to the environment.
Dused to decrease the entropy of the universe.
EAll of the above are correct.
AADP and phosphate
BFAD and NAD+
CFAD and NADPH
DADP and FAD
EADP and NAD+
Aan enzyme used widely in all kinds of cells.
Ba molecule that carries a great deal of chemical energy in a chemical bond.
Ca coenzyme used to inhibit or activate different enzymes.
Dthe precursor of a high energy membrane bounded protein.
AThey lower the energy of activation of a reaction by binding the substrate.
BThey raise the energy of activation of a reaction by binding the substrate.
CThey lower the amount of energy present in the substrate.
AAs the product is released, the enzyme breaks down.
BThe enzyme is like a key that fits into the substrate, which is like a lock.
CThe active site is permanently changed by its interaction with the substrate.
_____9. Which statement is Not true about the effects of various conditions on the activity of an enzyme?
AHigher temperatures generally increase the activity of an enzyme up to a point.
BAbove a certain range of temperatures, the protein of an enzyme is denatured.
CA change in pH can cause an enzyme to be inactivated.