Unformatted text preview: BIOS-352/CHEM-352 Introductory Biochemistry
Semester: Fall 2018
1 of 6
Please put your name on every page
There are 6 pages
The maximum score for this test is 100 points
Circle the correct answer(s) for the multiple-choice questions
Use of calculators, smartphones, computers, and supplementary
materials, such as textbooks or notes from lectures, during the
examination is strictly prohibited
You have 60 minutes (1 hour) to answer the questions
of 8 points
of 10 points
of 20 points
of 17 points
of 21 points
of 24 points
of 100 points
Question 1. (3 pts) Which one of the following statements is TRUE?
A. In an anabolic process, simple precursors are converted to more complex products.
B. Entropy is available to do work at constant temperature and pressure.
C. Metabolism is defined as the breakdown of complex molecules to release energy.
D. In any chemical process, the free energy of the products must equal that of the
E. Catabolic processes require an overall input of energy.
Question 2. (3 pts.) All of the following contribute to the large, negative, free-energy
change upon hydrolysis of "high-energy" compounds except:
electrostatic repulsion in the reactant.
low activation energy of forward reaction.
stabilization of products by extra resonance forms.
stabilization of products by ionization.
stabilization of products by solvation.
Question 3. (2 pts) People with lactose intolerance are unable to fully digest the
lactose in milk. The usual cause is insufficient expression of the enzyme that cleaves
the disaccharide in the intestines. Which enzyme is needed to cleave lactose so that the
products of the reaction can enter glycolysis? Circle the correct choice.
hexokinase aconitase aldolase isomerase (lactase) glycogen phosphorylas
Question 4. (2 pts) Which statement concerning redox reactions is FALSE?
A.) Oxidation is the transfer of one or more electrons to an atom or molecule.
B. Oxidation is the removal of one or more electrons from an atom or molecule.
C. For every reduction reaction that occurs, an oxidation reaction must also occur.
D. The reduced and oxidized versions of an electron donor form a conjugate redox pair.
E. A molecule that donates an electron can also be called a reducing agent.
Question 5. Consider the following reaction: At equilibrium, the concentrations are as
Notes: Use these rounded numbers for your calculations:
Gas constant = R = 8 J/molk
Faraday constant = F = 96 J/Vmol
In 5 = 2
In 3 = 1
In 0.2 = -2
In 200 = 5...
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