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BCH Exam 1 questions and correct answers
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BCH Exam 1 questions and correct answers
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BCH Exam 1Which of the following is not a serine protease? A) Chymotrypsin B) Trypsin C) Elastase D) Collagenase -
correct answer ✔✔Collagenase
If trying to find potential life-hosting worlds, which elements would you expect astrophysicists are
looking for in highest abundance in these distant solar systems? - correct answer ✔✔O, C, N, H
The strongest non-covalent intermolecular forces are: - correct answer ✔✔Ionic Interactions
Which of the following assembles by association of multiple protofilaments? A) Myosin B) Actin C)
Tubulin D) Keratin E) Collagen - correct answer ✔✔Tubulin
What is the sign of the entropy change when dry ice sublimates? - correct answer ✔✔Positive
Which of the following proteins contain a high percentage of a modified Pro residue? A) Keratin B)
Collagen C) Tubulin D) Actin E) Myosin - correct answer ✔✔Collagen
In SDS gel electrophoresis A) proteins are separated based on their molecular weight B) only proteins
with aromatic amino acids may be separated C) the largest proteins move the farthest D) all of the above
- correct answer ✔✔A (proteins are separated based on their molecular weight)
The tertiary structures of myglobin, α-hemoglobin and β-hemoglobin are nearly identical and are
therefore nearly identical in primary structure. T/F - correct answer ✔✔F (False)
Using what you have learned about acidic functional groups, which form of this compound is likely to
predominate in the cell at pH 7.4? Pyruvic Acid or Pyruvate? - correct answer ✔✔Pyruvate
What techniques are useful in determining the primary structure of peptides? - correct answer ✔✔Mass
Spectrometry and Edman sequencing
, Under what conditions would an amine group be mostly charged? (relation of pH and pK) - correct
answer ✔✔pH < pK
Which of the following is NOT an element of protein secondary structure? A) Alpha helix B) Peptide bond
C) Beta sheet D) Polypeptide loop E) All of the above are elements of protein secondary structure. -
correct answer ✔✔B (Peptide Bond)
What shapes are the oxygen saturation curves of hemoglobin and myoglobin, respectively. - correct
answer ✔✔Sigmoidal, Hyperbolic
What is the [H+] for saliva (pH ~6.6) - correct answer ✔✔2.5 x 10^(-7) M
For an endergonic reaction, is delta G positive or negative? - correct answer ✔✔Positive
Which of the following amino acids could bind to the specificity pocket of Trypsin? A) Gly B) Lys C) Asp D)
Gln E) Val - correct answer ✔✔Lys
Which amino acid would most likely associate with the inner part of the lipid bilayer? A) V B) E C) H D) D
E) K - correct answer ✔✔A (or V)
Multiple enzymes that share the same catalytic function are - correct answer ✔✔Isozymes
Carboxylate group - correct answer ✔✔COO-
Which can be unicellular: Eukaryotes or Prokaryotes - correct answer ✔✔Both
Which of the following proteins contain polypeptide chains that associate in a coiled-coil interaction?
Actin, Keratin, and Myosin - correct answer ✔✔Keratin and Myosin
What type of interactions are responsible for the characteristic strength of keratin fibers? - correct
answer ✔✔van der Waals and disulfide bonds
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