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Biology II Ch. 6 Mastery Test in Worksheets

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
The useful energy conversion in photosynthesis is
a.
chemical to solar
c.
mechanical to heat
b.
heat to mechanical
d.
solar to chemical
 

 2. 
Any energy transformation involves the loss of some energy as
a.
electricity
c.
light
b.
heat
d.
motion
 

 3. 
In the enzymatically-controlled chemical reaction A --> B + C, A is the
a.
cofactor
c.
product
b.
enzyme
d.
substrate
 

 4. 
An enzyme, functioning best at a pH of 3, is in a neautral solution at a temperature of 40 degrees C. Its activity will increase by
a.
decreasing the amount of substrate
b.
denaturing the enzyme
c.
increasing the temperature 10 more degrees
d.
making the pH more acidic
 

 5. 
In the reaction A + B --> C, the reaction rate may slow down through feedback inhibition by
a.
increasing the concentration of A
c.
increasing the concentration of C
b.
increasing the concentration of B
d.
decreasing the concentration of B
 

 6. 
The energy laws
a.
account for why energy does not cycle
b.
say that some loss of energy always accompanies transformation
c.
say that energy can be made available to living things
d.
all of these are correct
 

 7. 
In a metabolic pathway
a.
A, B, C, and D are substrates
c.
each reaction requires its own enzyme
b.
B, C, D, and E are products
d.
all of these are correct
 

 8. 
The enzyme-substrate complex
a.
indicates that an enzyme has denatured
b.
accounts for why enzymes lower the energy of activation
c.
is nonspecific
d.
all of these are correct
 

 9. 
The tendency for an ordered system to become spontaneously disordered is called
a.
thermodynamics
c.
activation
b.
entropy
d.
energy conversion
 

 10. 
A coupled reaction occurs when energy released from a(n) __________________ reaction is used to drive a(n) ___________________ reaction.
a.
endergonic; exergonic
c.
exergonic; endergonic
b.
breakdown;exergonic
d.
chemical; mechanical
 

 11. 
NAD+ and FAD are
a.
dehydrogenases
c.
coenzymes
b.
proteins
d.
both A and C are correct
 

 12. 
NADH takes electrons to
a.
ATP
c.
the electron transport system
b.
NADPH
d.
all of these are correct
 

 13. 
The electron transport system is properly associated with
a.
the production of ATP
b.
chemiosmosis
c.
both aerobic respiration and photosynthesis
d.
all of these are correct
 

 14. 
ATP is used for
a.
chemical work
c.
mechanical work
b.
transport work
d.
all of these are correct
 

 15. 
The hydrogen ions that flow across the inner mitochondrial membrane are coupled to the formation of
a.
enzymes
c.
acids
b.
carbohydrates
d.
ATP
 

 16. 
Which statement is NOT correct about enzymes?
a.
They usually end in the suffix “-ase”
b.
They catalyze only one reaction
c.
They increase the energy of activation
d.
They bind temporarily with the substrate
 

 17. 
Which of these is NOT expected to increase the rate of an enzymatic reaction?
a.
add more enzymes
c.
boil rapidly
b.
remove inhibitions
d.
adjust the pH to optimum level
 

 18. 
Which of these will result in a larger supply of ATP for an animal?
a.
muscle contraction
b.
basking in the sun
c.
increased activity of the electron transport system
d.
inhibiting the ATP synthase complex
 

 19. 
Since energy does not cycle, animal cells
a.
require a continuing source of glucose
c.
must produce ATP nonstop
b.
are dependent on plant cells
d.
all of these are correct
 

 20. 
Synthetic reactions
a.
require the participation of ATP
b.
do not require enzymes
c.
are represented by S + E --> ES --> P
d.
are coupled directly to glucose breakdown
 

Short Answer
 

 21. 
Why couldn’t life exist without a continuing supply of solar energy?
 

 22. 
Why are enzymes absolutely necessary to the continued existence of a cell?
 



 
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