BIO Exam 2B 2015: Question Preview (ID: 27218)


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the sum of all of the chemical reactions in an organism is called
a) catabolism b) anabolism c) metabolism d) embolism
in an exothermic reaction
a) energy is released b) energy is absorbed c) the activation energy is negative d) a catalyst is always involved
the activity of an enzyme depends on
a) temperature b) ionic conditions c) pH d) all of the rest are correct
enzymes catalyse reactions by
a) lowering the activation energy b) reducing the energy absorbed c) reducing the heat released d) increasing the temperature
To catalyze a reaction means to
a) speed up the reaction rate b) lower the reaction threshold temperature c) alter the reaction equilibrium d) change the direction of the reaction
In the photosynthesis reaction, 6CO2 + 6H20 → C6H12O6 + 602, there are 18 oxygen atoms in the reactants: how many oxygen atoms in the products?
a) 18 b) 6 c) 12 d) 36
enzymes are
a) proteins b) carbohydrates c) lipids d) nucleic acids
the 'hill' over which reactants must go to start a chemical reaction is the
a) enzyme action b) catalyst threshold c) temperature increase d) activation energy
CH4 + 2O2 → CO2 + 2H2O. The products in this reaction include
a) methane and oxygen b) carbon dioxide and water c) carbon dioxide and oxygen d) methane and water
anabolic reactions are ones in which
a) organic molecules are formed b) organic molecules are broken down c) organic molecules release energy d) organic molecules absorb energy
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