1
A) heat is energy B) motion energy converts to heat energy C) at the atomic level, motion is continuous D) entropy increases 2
A) activation B) destabilization C) kinetic D) free 3
A) H is lower B) reactants contain more energy than the product does C) S in the system is higher D) products of the reaction contain more energy than the reactants 4
A) It is formed by attaching a phosphate group to ADP with a high-energy bond. B) In most reactions involving ATP, only the outer, high-energy bond is hydrolized. C) It is a good long-term energy storage molecule. D) When dephosphorylated, ATP becomes ADP. 5
A) glycolysis B) oxygen-forming photosynthesis C) the degradation of organic molecules with the released energy stored in ATP D) anaerobic respiration 6
A) created B) destroyed C) converted D) all of the above E) none of the above 7
A) ATP B) NAD+ C) ADP D) enzymes E) O2 8
A) make endergonic reactions proceed spontaneously B) lower the activation energy of a reaction C) are not very specific in their choice of substrates D) are needed in large quantities because they are used up during catalysis E) none of the above 9
A) carbohydrates B) lipids C) steroids D) nucleic acids E) proteins 10
+ is a(n)A) enzyme B) coenzyme C) active site D) high-energy bond E) allosteric activator 11
A) CO2 B) O2 C) N2 D) NAD+ E) NADH 12
A) the reactants contain less free energy than the products B) the reactants contain more free energy than the products C) no activation energy is required D) catalysis cannot occur E) substrates outnumber enzymes 13
A) heat B) free energy C) enthalpy D) potential energy E) activation energy 14
A) entropy B) activation energy C) thermodynamics D) free energy E) heat 15
A) nitrogen fixation B) glycolysis C) chemiosmosis D) intramolecular catalysis E) intermolecular catalysis 16
A) stop B) slow down C) speed up D) go in a different direction E) you can never tell 17
A) energy B) electrons C) hydrogen protons D) all of the above E) none of the above 18
A) some substrates can make enzymes change shape slightly B) all enzymes have the same pH optimum C) the active sites of all enzymes have the same three-dimensional shape D) all of the above E) none of the above 19
A) break hydrogen bonds in proteins B) help facilitate enzyme activity C) increase activation energy D) are very rare in living organisms E) are linked to ATP by high-energy bonds 20
A) 730 cal/mole B) 7.3 cal/mole C) 7.3 kcal/mole D) 73 kcal/mole E) 730 kcal/mole 21
A) H -- I B) I -- J C) I -- H D) J -- K E) K -- L 22
A) they change the three-dimensional shape of the enzyme B) they disrupt hydrogen and ionic bonds in the enzyme C) they disrupt hydrophobic interactions in the enzyme D) all of the above E) none of the above 23
A) oxidation B) reduction C) induced fit D) enthalpy E) allosteric inhibition 24
A) entropy B) the reactants C) enthalpy D) free energy E) the products 25
2+ in order to catalyze the conversion of substrate X. The zinc is best identified as a(n):A) coenzyme B) cofactor C) substrate D) product E) enzyme 26
+ -----> oxaloacetic acid + NADH + H+ delta G = +7.1 kcal.
Which of the following statements are true of this reaction?A) Malic acid is reduced to oxaloacetic acid. B) b. The bonds within the products are more stable than those within the substrates. C) The reaction is endergonic. D) Entropy is increasing. E) Both b and c, but not a and d. 27
+ A) is being reduced. B) is a coenzyme. C) is an oxidizing agent. D) all of the above. E) a and b, but not c. 28
+ is a reducing agent.A) True B) False 29
A) delta G must be negative B) delta H must be negative C) delta S must be positive D) delta G must be positive E) b, c, and d, but not a 30
A) True B) False 31
A) do not occur in living systems B) require the presence of oxygen C) involve the loss of electrons termed oxidation D) involve the gaining of energy by an oxidized substance E) both a and b 32
A) p/PH B) temperature C) allosteric inhibitors D) availability ATP E) cofactors 33
A) anabolic reactions-expend energy B) reduction-gain of an electron C) endergonic reaction-anabolism D) exergonic reaction-catabolism E) activation energy-entropy
2002 McGraw-Hill Higher Education