Introduction to Biochemistry Old Exam Questions Dr. Gustin Exam 1
HC2H3O2(aq) + H2O(l) <-> H3O+(aq) + C2H3O2–(aq)
Buffer solution 1: H3PO4/H2PO4– pKa = 2.14
Buffer solution 2: H2CO3/HCO3– pKa = 6.35
Buffer solution 3: NH3/NH4+ pKa=9.25
Buffer solution 4: HF/F– pKa = 3.17
For questions 5-7, please refer to the following titration curve of a weak acid (H2A) and strong base.
H3PO4 pKa = 2.14
H2CO3 pKa = 6.35
HF pKa = 3.17
For questions 10-11, refer to the conversion of glucose 1-phosphate to glucose 6-phosphate is an equilibrium.
Glucose 1-phosphate <-> glucose 6-phosphate
For questions 13-14, refer to the following equation:
ΔG = ΔH- TΔS
13.If a reaction releases free energy, the reaction is ____________.
14.If the ΔH=0 and if the entropy of the system increases, ΔG will be
15.The pI of valine is
a.2.3 b. 9.7 c. 1.0 d. 6.0 e. None of the above
16.The following is the structure for glucose.
Which of the following is true about glucose?
For questions 24-25, refer to the following diagram.
26.Which amino acid is rarely found in an alpha helix?
27.Which of the following refers to the amino acid sequence of a protein?
28.Which of the following refers to all aspects of the three-dimensional folding of a polypeptide?
29.Which of the following stabilizes the correct protein structure after folding?
30.The main factor that explains why proteins fold is
For question 31, refer to Diagram A that is attached to the test.
31.The diagram above represents
32.Which of the following is true about an alpha helix?
Write directly on the exam
CO2(g) + H2O(l) <-> H2CO3(aq) + H2O (l) <-> H3O+ (aq) + HCO3–(aq)
38a. Draw the graph for the binding of hemoglobin vs. pO2.
To answer e, refer to the following reaction: CO2 + H2O à H+ + HCO3–
due to _____________ Principle. Carbon dioxide binds to the hemoglobin at different site of the protein. What happens to hemoglobin’s affinity for O2 when CO2 bind? Does this scenario happen in the tissues or the lungs? Explain.
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