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BIO Exam 2B 2015
Test Description: Chemistry of life part 2
Instructions: Answer all questions to get your test result.
1) CH4 + 2O2 → CO2 + 2H2O. The products in this reaction include
A
methane and water
B
carbon dioxide and water
C
carbon dioxide and oxygen
D
methane and oxygen
2) the 'hill' over which reactants must go to start a chemical reaction is the
A
activation energy
B
enzyme action
C
temperature increase
D
catalyst threshold
3) enzymes are
A
lipids
B
carbohydrates
C
proteins
D
nucleic acids
4) In the photosynthesis reaction, 6CO2 + 6H20 → C6H12O6 + 602, there are 18 oxygen atoms in the reactants: how many oxygen atoms in the products?
A
12
B
6
C
18
D
36
5) To catalyze a reaction means to
A
speed up the reaction rate
B
lower the reaction threshold temperature
C
change the direction of the reaction
D
alter the reaction equilibrium
6) enzymes catalyse reactions by
A
reducing the heat released
B
lowering the activation energy
C
reducing the energy absorbed
D
increasing the temperature
7) the activity of an enzyme depends on
A
ionic conditions
B
temperature
C
all of the rest are correct
D
pH
8) in an exothermic reaction
A
the activation energy is negative
B
energy is released
C
a catalyst is always involved
D
energy is absorbed
9) the sum of all of the chemical reactions in an organism is called
A
embolism
B
catabolism
C
anabolism
D
metabolism
10) anabolic reactions are ones in which
A
organic molecules release energy
B
organic molecules absorb energy
C
organic molecules are formed
D
organic molecules are broken down
*select an answer for all questions
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