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UNE Unit 1 Exam Biochemistry – Qs And As
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UNE Unit 1 Exam Biochemistry – Qs And As
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UNE Unit 1 Exam Biochemistry – Qs And Asα-helices and β-sheets are primarily stabilized by which of the following
interactions? Correct Ans - Hydrogen bonding
An α-helical arrangement of amino acids is considered to be what level of
protein structure? Correct Ans - Secondary structure of the protein
Hemoglobin has the ability to display cooperative binding while myoglobin
does not display this binding kinetic pattern. Which of the following
differences between the two proteins accounts for this difference in
binding kinetics? Correct Ans - The presence of quaternary
structure in hemoglobin
How do most enzymes reduce the activation energy needed to move a
reaction forward? Correct Ans - Providing an active site most
complementary the transition state
Movement of ammonia from an amino acid to an α-keto acid involves a
family of enzymes best categorized as which of the following? Correct
Ans - Transferases
Which of the following best describes tertiary structure? Correct Ans -
Interactions between α-helices and β sheets to form a domain
Which of the following best describes the structure of heme? Correct
Ans - A planar porphyrin ring that binds iron
Allosteric activators of hemoglobin will increase substrate binding through
which of the following mechanisms? Correct Ans - Binding the
protein, and keeping it in the "R" conformation
A 22-year old female presents to the emergency department with acute
abdominal pain. She indicates the pain came on rapidly in her mid-
abdominal region. Laboratory tests illustrate elevated levels of amylase.
This result would indicate a dysfunction in which of the following organs?
Correct Ans - Pancreas
, Cleavage of fructose 1, 6 bisphosphate to dihydroxyacetone and
glyceraldehyde 3-phosphate is achieved by what class of enzymes?
Correct Ans - Lysase
How do most enzymes reduce the activation energy needed to move a
reaction forward? Correct Ans - Providing an active site most
complementary to the transition state
Ligases are a class of enzymes characterized by their ability to: Correct
Ans - Synthesize bonds between carbon atoms and an additional atom
that is involved in the cleavage of a high energy bond.
All of the following are considered coenzymes except: Correct Ans -
HEME
Biotin
Pyridoxal phosphate
Thiamine pyrophosphate
mechanism: allosteric regulation Correct Ans - activation or
inhibition of enzyme activity by small molecules (metabolites) that interact
non-covalently
allosteric effector Correct Ans - - non-covalently binds to site other
than substrate
- reversible binding of an effector to the enzyme allows for very rapid
response times (change in enzyme activity resulting from change in
concentration of allosteric effector)
- usually has no structural similarity to substrate
A decrease in blood pH from 7.0 to 6.0 would be accompanied by which of
the following changes in ion concentration Correct Ans - A 10-fold
increase in hydrogen ion concentration-
Asparate is classified as a(n) Correct Ans - charged amino acid
Hemoglobin binds Oxygen with a greater affinity in the: Correct Ans -
R-State --- Hemoglobin binds oxygen with a greater affinity in the R state.
As oxygen binds each subunit, the affinity for oxygen increases; this is
termed cooperative binding.
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