UNE MEDICAL BIOCHEMISTRY UNIT 1 MIDTERM TEST |
QUESTIONS AND ANSWERS | VERIFIED ANSWERS (100% CORRECT) |
LATEST EXAM UPDATE
Changes 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 ANSWER - 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 ANSWER - 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 ANSWER - 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 ANSWER - 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
ANSWER - 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 ANSWER - 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 ANSWER - 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 ANSWER - pyridoxal phsophate
Which of the following best describes tertiary structure?
QUESTIONS AND ANSWERS | VERIFIED ANSWERS (100% CORRECT) |
LATEST EXAM UPDATE
Changes 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 ANSWER - 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 ANSWER - 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 ANSWER - 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 ANSWER - 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
ANSWER - 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 ANSWER - 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 ANSWER - 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 ANSWER - pyridoxal phsophate
Which of the following best describes tertiary structure?
