AP Bio : Energy and Enzymes UPDATED
ACTUAL Exam Questions and CORRECT
Answers
in animal cells , glycolysis occurs in the - CORRECT ANSWER - cytosol
when a molecule of NAD+ gains a hydrogen atom (not a proton ) The NAD+ molecule becomes
- CORRECT ANSWER - reduced
CO2 is released during which of the following stages of cellular respiration - CORRECT
ANSWER - oxidation of pyruvate to acetyl CoA and the citric acid cycle
where are the proteins of the electron transport chain located - CORRECT ANSWER - inner
mitochondrial membrane
inside the active mitochondrion , most electrons follow which pathway - CORRECT
ANSWER - citric acid cycle - NADH- ETC -oxygen
what is the source of oxygen used to form water in the complete reactions of cellular respiration -
CORRECT ANSWER - co2
where in the mitochondria is the enzyme ATP Synthase localized - CORRECT ANSWER -
inner membrane
When hydrogen ions are pumped from the mitochondrial matrix across the inner membrane and
into the intermembrane space, the result is - CORRECT ANSWER - the creation of a proton
motive force
most co2 from catabolism is released during - CORRECT ANSWER - the citric acid cycle
, If pyruvate oxidation is blocked , what will happen to the levels of oxaloacetate and citrate in the
citric acid cycle shown - CORRECT ANSWER - oxaloacetate will accumulate and citrate will
decrease
In the presence of oxygen , the three carbon compound pyruvate can be catabolized in the citric
acid cycle. First , however, the pyruvate 1)loses a carbon 2)is oxidized to form a two carbon
compound , which 3) covalemtluy bound to coenzyme A. these three steps result in the formation
of - CORRECT ANSWER - acetyl COa, NADH, H , CO2
The immediate energy source that drives ATP synthesis by ATP synthase during oxidative
phosphorylation is the - CORRECT ANSWER - H + concentration gradient across the
membrane holding the ATP synthase
which metabolic pathway is common to both fermentation and cellular respiration of a glucose
molecule - CORRECT ANSWER - glycolysis
The final electron acceptor of the electron transport chain that functions in aerobic oxidative
phosphorylation is - CORRECT ANSWER - oxygen
Aminolevulinate dehydratase (ALAD) is an enzyme that relies on zinc as a coenzyme. A zinc ion
binds to the ALAD active site, where it forms favorable interactions with the side chains of three
amino acids. Researchers have found that substituting a lead ion for a zinc ion in the ALAD
active site causes inhibition of ALAD.
Which of the following statements best helps explain how the lead ion causes inhibition of
ALAD? - CORRECT ANSWER - It changes the three-dimensional structure of the active site
so that ALADALAD is no longer compatible with its substrate.
Acetylcholinesterase (AChE) is a protein that catalyzes the conversion of acetylcholine to acetate
and choline. When the concentration of AChE in an aqueous solution is held constant, the rate of
the reaction catalyzed by AChE increases with increasing concentrations of substrate. At low
concentrations of acetylcholine, a small increase in the substrate concentration results in a large
increase in the reaction rate. At high concentrations of acetylcholine, however, a large increase in
the substrate concentration results in only a small increase in the reaction rate.
ACTUAL Exam Questions and CORRECT
Answers
in animal cells , glycolysis occurs in the - CORRECT ANSWER - cytosol
when a molecule of NAD+ gains a hydrogen atom (not a proton ) The NAD+ molecule becomes
- CORRECT ANSWER - reduced
CO2 is released during which of the following stages of cellular respiration - CORRECT
ANSWER - oxidation of pyruvate to acetyl CoA and the citric acid cycle
where are the proteins of the electron transport chain located - CORRECT ANSWER - inner
mitochondrial membrane
inside the active mitochondrion , most electrons follow which pathway - CORRECT
ANSWER - citric acid cycle - NADH- ETC -oxygen
what is the source of oxygen used to form water in the complete reactions of cellular respiration -
CORRECT ANSWER - co2
where in the mitochondria is the enzyme ATP Synthase localized - CORRECT ANSWER -
inner membrane
When hydrogen ions are pumped from the mitochondrial matrix across the inner membrane and
into the intermembrane space, the result is - CORRECT ANSWER - the creation of a proton
motive force
most co2 from catabolism is released during - CORRECT ANSWER - the citric acid cycle
, If pyruvate oxidation is blocked , what will happen to the levels of oxaloacetate and citrate in the
citric acid cycle shown - CORRECT ANSWER - oxaloacetate will accumulate and citrate will
decrease
In the presence of oxygen , the three carbon compound pyruvate can be catabolized in the citric
acid cycle. First , however, the pyruvate 1)loses a carbon 2)is oxidized to form a two carbon
compound , which 3) covalemtluy bound to coenzyme A. these three steps result in the formation
of - CORRECT ANSWER - acetyl COa, NADH, H , CO2
The immediate energy source that drives ATP synthesis by ATP synthase during oxidative
phosphorylation is the - CORRECT ANSWER - H + concentration gradient across the
membrane holding the ATP synthase
which metabolic pathway is common to both fermentation and cellular respiration of a glucose
molecule - CORRECT ANSWER - glycolysis
The final electron acceptor of the electron transport chain that functions in aerobic oxidative
phosphorylation is - CORRECT ANSWER - oxygen
Aminolevulinate dehydratase (ALAD) is an enzyme that relies on zinc as a coenzyme. A zinc ion
binds to the ALAD active site, where it forms favorable interactions with the side chains of three
amino acids. Researchers have found that substituting a lead ion for a zinc ion in the ALAD
active site causes inhibition of ALAD.
Which of the following statements best helps explain how the lead ion causes inhibition of
ALAD? - CORRECT ANSWER - It changes the three-dimensional structure of the active site
so that ALADALAD is no longer compatible with its substrate.
Acetylcholinesterase (AChE) is a protein that catalyzes the conversion of acetylcholine to acetate
and choline. When the concentration of AChE in an aqueous solution is held constant, the rate of
the reaction catalyzed by AChE increases with increasing concentrations of substrate. At low
concentrations of acetylcholine, a small increase in the substrate concentration results in a large
increase in the reaction rate. At high concentrations of acetylcholine, however, a large increase in
the substrate concentration results in only a small increase in the reaction rate.
