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UNE Medical Biochemistry Unit 1 Test – Q’s & A’s
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UNE Medical Biochemistry Unit 1 Test – Q’s & A’s
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UNE Medical Biochemistry Unit 1 Test – Q’s & A’sChanges in the physiological variables listed below can alter the affinity of
hemoglobin for oxygen. Which of the following will lower the affinity of
hemoglobin for oxygen?
a) decrease in protons
b) increase in 2,3 bisphosphoglycerate (BPG)
c) increase in pH
d) decrease in CO2 Correct Ans - Increase in 2,3
bisphosphoglycerate (BPG)
Domains are common structural elements that retain a particular function
within the protein. Which of the following is an example of a protein
domain?
a) a prosthetic group such as heme
b) irregular coils and loops
c) an arrangement of β-strands connected by α- helixes
d) a single α- helix Correct Ans - An arrangement of β-strands
connected by α-helixes
A 22-year-old female is diagnosed with acute pancreatitis. Elevation of
which of the following serum enzymes would be consistent with this
diagnosis?
a) lactate dehydrogenase
b) amylase
c) troponin
d) creatine kinase Correct Ans - amylase
Movement of ammonia from an amino acid to an alpha-keto acid involves a
family of enzymes best categorized as:
a) transferases
b) ligases
c) lyases
d) isomerases Correct Ans - transferases
, Which of the following proteins is likely to have quaternary structure?
a) a protein that contains both α-helix and β-sheet secondary structures
b) a multimeric protein that contains multiple peptide chains
c) a small protein consisting of a single amino acid chain
d) a large transmemberane protein with seven alpha helical domains
Correct Ans - a multimeric protein that contains multiple peptide
chains
Cleavage of fructose 1, 6 bisphosphate to dihydroxyacetone and
glyceraldehyde 3-phosphate is achieved by what class of enzymes?
a) ligase
b) lyase
c) transferase
d) hydrolase Correct Ans - Lyase
Which of the following best describes the structure of heme?
a) a planar porphyrin ring that binds iron
b) a nicotinamide structure that is readily oxidized
c) an n-linked glycosylation
d) a negatively charged phosphate group Correct Ans - a planar
porphyrin ring that binds iron
Prosthetic groups are complex nonprotein molecules that participate in
catalysis by providing functional groups that form a covalent intermediate
between the enzyme and the substrate. Which of the following is an
example of a coenzyme or cofactor that participates in a covalent catalysis
reaction?
a) ATP
b) OH-
c) NADH
d) pyridoxal phosphate Correct Ans - pyridoxal phsophate
Which of the following best describes tertiary structure?
a) interactions between differing subunits of a protein
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