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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 oxygen
C
carbon dioxide and water
D
methane and oxygen
2) the 'hill' over which reactants must go to start a chemical reaction is the
A
temperature increase
B
activation energy
C
enzyme action
D
catalyst threshold
3) enzymes are
A
carbohydrates
B
nucleic acids
C
proteins
D
lipids
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
6
B
18
C
12
D
36
5) To catalyze a reaction means to
A
speed up the reaction rate
B
change the direction of the reaction
C
lower the reaction threshold temperature
D
alter the reaction equilibrium
6) enzymes catalyse reactions by
A
reducing the energy absorbed
B
reducing the heat released
C
lowering the activation energy
D
increasing the temperature
7) the activity of an enzyme depends on
A
ionic conditions
B
all of the rest are correct
C
pH
D
temperature
8) in an exothermic reaction
A
energy is released
B
energy is absorbed
C
a catalyst is always involved
D
the activation energy is negative
9) the sum of all of the chemical reactions in an organism is called
A
anabolism
B
catabolism
C
embolism
D
metabolism
10) anabolic reactions are ones in which
A
organic molecules release energy
B
organic molecules are formed
C
organic molecules absorb energy
D
organic molecules are broken down
*select an answer for all questions
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