Exam (elaborations)
Bioc 385 Exam 1 Review Questions & Detailed Answers
- Course
- BIOC 385
- Institution
- North Dakota State University
Bioc 385 Exam 1 Review Questions & Detailed Answers
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Bioc 385 Exam 1 Review Questions & DetailedAnswers
Select TWO true statements from the list regarding the structure and function of
enzymes - ANS - Enzyme cofactors can increase the chemical functionality of
enzymes, which are otherwise limited by the R groups of amino acids.
- Enzymes increase the rates of biochemical reactions without changing the
equilibrium constant.
What is the overall balanced reaction for the light reactions of photosynthesis? -
ANS 2 H2O + 8 photons + 2 NADP + 3 ADP + 3 Pi --> O2 + 2 NADPH + 3 ATP
If the equilibrium constant (Keq) is greater than 1, which direction will the reaction
proceed? - ANS spontaneously to products
The study of biochemistry attempts to explain ___. - ANS biological processes at
the molecular and cellular level
spontaneous at ALL temperatures - ANS delta H = negative
delta S = positive
,Which of the following is NOT an outcome from excitation of an electron in a
chlorophyll molecule? - ANS photoreduction of the neighboring chlorophyll
molecule
resonance energy transfer - ANS important for light energy harvesting; a way for a
chlorophyll molecule to absorb an electron and pass this energy to a nearby
molecule
three outcomes of an excited electron in a chlorophyll molecule - ANS 1. Return of
the chlorophyll molecule to the ground state via fluorescence
2. Photooxidation of the chlorophyll molecule
3. Return of the chlorophyll molecule to the ground state with excitation of a
nearby chlorophyll molecule via resonance energy transfer
Which of the following is TRUE regarding hemes but FALSE regarding chlorophylls?
- ANS porphyrin ring coordinates Fe2+
How does the O2 evolving complex (OEC) link the oxidation of H2O with the
restoration of P680? - ANS - For every P680 chlorophyll molecule that is photo-
oxidized, one electron from the OEC is used to reduce P680+
- The four electrons formed from the oxidation of H2O to O2 in the PSII are held by
a Mn4 cluster in the OEC.
, Which of the following statements best supports the idea that photon absorption
by chlorophyll is an all-or-none phenomenon? - ANS Each delocalized electron
above and below the porphyrin ring possesses an energy difference with its
adjacent orbital that corresponds to the energy of a photon within the visible light
range.
OIL RIG - ANS oxidation = loss
reduction = gain
If the Gibbs free energy change value for a reaction is less than zero, this reaction
is ____. - ANS exergonic
flux - ANS defined as the rate at which metabolites are interconverted
Enzyme active sites are ____. - ANS characterized as a pocket or cleft
Which answer correctly classifies the compound with its relationship to aspartate
transcarboxylase? - ANS ATP; allosteric activator
Why did the Biosphere 2 project end only after a few months? - ANS levels of CO2
rose to dangerous levels
In what location of the cell does the Calvin-Benson cycle occur? - ANS chloroplast
stroma
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