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USABO Exam Questions With Complete Solutions
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USABO Exam Questions With Complete Solutions
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USABO Exam Questions With Complete SolutionsAn unnamed acid has a pKa value of 4.76. Which of the
following is closest to the ratio of the concentration of its
protonated to deprotonated forms in a pH environment of 6.8?
Correct Answers 1:100
In the extracellular matrix of an animal cell, you would like to
test the binding partner of integrins in vitro. Integrins would
most likely require firm attachment to which of the above
option? Correct Answers Actin
Nitrogen fixation has the following net chemical reaction: N2 +
8e- + 8H+ + 16 ATP -> 2NH3 + H2 + 16ADP + 16Pi
If 1 kg of ATP (molar mass 507.2 g/mol) and 3 g of nitrogen gas
(molar mass 28 g/mol) are supplied as input, what is the
maximum yield of ammonia (molecular mass 17 g/mol)?
A. 1.8 g.
B. 2.5 g.
C. 3.6 g.
D. 4.2 g.
E. 4.9 g Correct Answers 3.6 g
Observe the seedlings growing below which have a loss of
function mutation in the ethylene receptor. Which of the
following statements are TRUE regarding this mutant's growth
response NOT being related to a triple response? Select one
response I,II,III,IV,V
I. This mutant will not respond to the exposure of ethylene under
any circumstances.
, II. This mutant has a constitutive activity where it leads to the
activation of kinase, which is important for the triple response.
III. This mutant has a constitutive activity where it leads to the
inactivation of kinase, which is important for the triple response.
IV. If this mutant is treated with aminoethoxyvinylglycine
(ethylene synthesis inhibitor), this mutant will be able to
undergo triple response.
V. If this mutant is treated with aminoethoxyvinylglycine
(ethylene synthesis inhibitor), this mutant will not respond to the
treatment and not undergo triple response. Correct Answers
I,III,V
Select the answer choice that correctly describes which chemical
species are oxidized, reduced, and phosphorylated in the process
of oxidative phosphorylation. Correct Answers Oxidized:
NADH & FADH2
Reduced: O2
Phosphorylated: ADP
T/F: Cytochrome a is more electronegative than cytochrome b
Correct Answers True
T/F: Cytochrome b is more electronegative than cytochrome c
Correct Answers True
T/F: FADH2 adds its electrons to complex III while NADH adds
its electrons in complex I. Correct Answers False
T/F: Ubiquinone proteins have a heme group to facilitate
electron transport Correct Answers False
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