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BICH 411 Final Exam - Old Questions
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BICH 411 Final Exam - Old QuestionsObligate aerobes
a) perish under conditions with O2
b) use oxidizing agents such as sulfate or nitrate as a primary food source
c) resemble the earliest life forms
d) all of the above
e) none of the above - ANS-e) none of the above
In catabolic pathways, major nutrients are _____ broken down resulting in the synthesis
of _____ - ANS-exergonically; ATP
Which of the the choices correctly ranks the following compounds from lowest level of
oxidation to highest level of oxidation?
1) CH2=CH2
2) CH3CHO
3) CH3COOH - ANS-1<2<3
Consider the following metabolic reaction:
Succinyl-CoA + Acetoacetate --> Acetoacetyl-CoA + Succinate (dG = 1.25 kJ/mol)
What is the Keq for this reaction at 25C? - ANS-0.60
Consider the same metabolic reaction in previous problem: the dG for the hydrolysis of
Succinyl-CoA is -33.9 kJ/mol. Determine the dG for the hydrolysis of Acetoacetyl-CoA
--> Acetoacetate + CoA - ANS--35.2 kJ/mol
The Keq is 1.1 at 25C for the following reaction. What is the dG for this reaction?
D-glucose-6-phosphate --> D-fructose-6-phosphate - ANS--236 J/mol
Consider the following metabolic reaction:
3-phosphoglycerate --> 2-phosphoglycerate; dG = +2.20 kJ/mol
What is the dG' for this reaction when the concentration of 2PG is 0.290 mM and the
concentration of 3PG is 2.90 mM at 37C? - ANS--3.73 kJ/mol
Given that the standard reduction potential of oxaloacetate is -0.135 V and the standard
reduction potential of NAD+ is -0.249 V. What is the dE for the oxidation of malate by
NAD+
Malate + NAD+ --> Oxaloacetate + NADH + H+ - ANS--0.114 V
,ATP contains _____ bonds - ANS-one phosphoester and two phosphoanhydride
Which of the following are factors that contribute to the large negative standard free
energy change for the reaction shown below?
a) the decrease in negative charge repulsion in the products compared to reactants
b) the precipitation of the insoluble Pi
c) the addition of a water molecule to the hydrophilic ATP molecule
d) the increase in resonance stabilization in the reactants compared to the products
e) all of the above - ANS-a) the decrease in negative charge repulsion in the products
compared to reactants
While _____ is always involved in reactions that require the transfer of 2 electrons,
_____ can participate in reactions that transfer either 1 or 2 electrons. - ANS-NAD+;
FAD
Which of the following must be regenerated for glycolysis to proceed?
a) NAD+
b) ATP
c) pyruvate
d) UDP-glucose
e) all of the above - ANS-a) NAD+
Acyl phosphates such as 1,3-BPG have a _____ phosphoryl group transfer potential
compared to ATP, which can be recognized by the _____ dG values for hydrolysis. -
ANS-greater; more negative
Consider the following metabolic reaction important in muscle and nerve cells:
ATP + creatine <--> phosphocreatine + ADP; dG = +12.6 kJ/mol
Under intracellular conditions, the dG' for the reaction, which is catalyzed by the enzyme
creatine kinase, is ~0 kJ/mol. From this information we can conclude that - ANS-the
reaction operates close to equilibrium in cells
The terminal electron acceptor in aerobic organisms is - ANS-O2
In redox half-reactions, a more positive standard reduction potential means
a) the oxidized form has a higher affinity for electrons
, b) the oxidized form has a lower affinity for electrons
c) the reduced form has a higher affinity for electrons
d) the greater the tendency for the oxidized form to accept electrons
e) A and D - ANS-e) A and D
Flux controlled enzymes are regulated by
a) changes in gene expression
b) allosteric effectors
c) substrate cycling
d) covalent modification
e) all of the above - ANS-e) all of the above
What are the correct coenzyme forms that correspond to X and Y in the following
reaction catalyzed by lactate dehydrogenase?
Pyruvate + X --> Lactate + Y - ANS-X = NADH, Y = NAD+
Negative feedback inhibition is one type of _______ metabolic control - ANS-allosteric
If Z = ATP formed via substrate level phosphorylation in the diagram below, which of the
following compounds (represented by an uppercase letter) contains a high-energy
bond?
A --(Enzyme 1)--> B --(Enzyme 2)--> C - ANS-Compound B
If a catabolic pathway is catalyzed by an enzyme that requires NAD+, what type of
reaction does the enzyme catalyze? - ANS-oxidation
Using the table below, rank redox centers in order of increasing ability to produce a
favorable electron flow
D = -0.002
F = -0.198
Q = +0.002
C = -0.053
Z = -0.225 - ANS-Z, F, C, D, Q
Lactose intolerance is caused by a deficiency of - ANS-lactase
Glycolysis produces a net yield of _______ ATP - ANS-2
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