BCH EXAM 1 QUESTIONS AND ANSWERS LATEST DOWNLOADED
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Which of the following types of bonding interactions is NOT classified as non-covalent?
a)Hydrogen bonding.
b)Electrostatic interactions.
c)Van der Waals.
d)Dipole-Dipole interactions.
e)none of the above - CORRECT ANSWERS E
T/F The hydrophobic effect is the movement of solvent across a semipermeable membrane from a
region of high solvent concentration to a region of lower solvent concentration. - CORRECT
ANSWERS false
Which statement best explains why nonpolar substances have low solubility in water?
a)They are much larger than water.
b)They are much denser than water.
c)They have strong mutual attractions.
d)They cannot form hydrogen bonds to water. - CORRECT ANSWERS d
What is the pH of a solution made by mixing equal volumes of 1 M sodium acetate and 1 M acetic acid?
(The pK of acetic acid is 4.76.)
1
3.76
4.76
5.76 - CORRECT ANSWERS 4.76
If the pK values for phosphoric acid are 2.15, 6.82 and 12.38, _____ would predominate at pH 5 while
_____ would predominate at pH 10.
H3PO4; H2PO4-
H3PO4; HPO42-
,BCH EXAM 1 QUESTIONS AND ANSWERS LATEST DOWNLOADED
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H3PO4; PO43-
H2PO4-; PO43-
H2PO4-; HPO42- - CORRECT ANSWERS H2PO4-; HPO42-
T/F The value of Kw is 1014 M2 at 25°C. - CORRECT ANSWERS false
What is the concentration of hydrogen ions at pH 3?
103 M
10-3 M
3M
0.3 M - CORRECT ANSWERS 10-3M
T/F The pK values for phosphoric acid are 2.15, 6.82, and 12.38. At pH 12.38, [H2PO4-] = [HPO42-] -
CORRECT ANSWERS False
The pK of acetic acid is 4.76. Which statement is true at pH 5.0?
a) [A-] = [HA]
b) [A-] < [HA]
c) [A-] > [HA] - CORRECT ANSWERS c
If the pK values for phosphoric acid are 2.15, 6.82 and 12.38, _____ would predominate at pH 5 while
_____ would predominate at pH 10.
a)H2PO4-; HPO42-
b)H3PO4; H2PO4-
c)H3PO4; HPO42-
d)H3PO4; PO43-
e)H2PO4-; PO43 - CORRECT ANSWERS a
,BCH EXAM 1 QUESTIONS AND ANSWERS LATEST DOWNLOADED
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The side chain of Serine is:
-CH2-CH2-S-CH3.
-CH2-SH.
-CH2OH.
-CH2-CH2-CH2-CH2-NH2.
-CH2COOH. - CORRECT ANSWERS -CH2OH
T/F In aqueous solution amino acids are rarely found in the neutral, unionized form. - CORRECT
ANSWERS True
Which amino acid side chain can form a hydrogen bond?
Alanine
Glycine
Threonine
Isoleucine - CORRECT ANSWERS threonine
Which one of the following sequences of five amino acids would most likely be located in the interior of
a globular soluble protein?
a)Tyr-Phe-Glu-Asn-Leu
b)Val-Ala-Val-Glu-Val
c)Met-Phe-Pro-Ile-Leu
d)Glu-Asn-Ser-Thr-Gln
e)Met-Cys-Pro-His-Tyr - CORRECT ANSWERS c
What is the net charge at pH 7.0 on a peptide with the sequence?
, BCH EXAM 1 QUESTIONS AND ANSWERS LATEST DOWNLOADED
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Ala-Thr-Leu-Asp-Ala-Lys-Pro-Glu
+2
+1
0
-1
-2 - CORRECT ANSWERS -1
Which amino acid side chain is NOT aromatic?
Tryptophan
Methionine
Phenylalanine
Tyrosine - CORRECT ANSWERS met
Molecular chaperones assist proteins in the formation of ___.
aggregates
tertiary structure
peptide bonds
primary structure - CORRECT ANSWERS tertiary
If the following mixture of proteins was applied to a size-exclusion chromatography column, what would
be the order of elution?
Proteins with molecular weights: myoglobin (17.7 kDa), hemoglobin (64.5 kDa), lysozyme (14.3 kDa) and
triose phosphate isomerase (57.4 kDa)
a)lysozyme, myoglobin, triose phosphate isomerase, hemoglobin
2025/2026 A COMPLETE SOLUTION ALL ANSWERS 100% ACCURATE
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Which of the following types of bonding interactions is NOT classified as non-covalent?
a)Hydrogen bonding.
b)Electrostatic interactions.
c)Van der Waals.
d)Dipole-Dipole interactions.
e)none of the above - CORRECT ANSWERS E
T/F The hydrophobic effect is the movement of solvent across a semipermeable membrane from a
region of high solvent concentration to a region of lower solvent concentration. - CORRECT
ANSWERS false
Which statement best explains why nonpolar substances have low solubility in water?
a)They are much larger than water.
b)They are much denser than water.
c)They have strong mutual attractions.
d)They cannot form hydrogen bonds to water. - CORRECT ANSWERS d
What is the pH of a solution made by mixing equal volumes of 1 M sodium acetate and 1 M acetic acid?
(The pK of acetic acid is 4.76.)
1
3.76
4.76
5.76 - CORRECT ANSWERS 4.76
If the pK values for phosphoric acid are 2.15, 6.82 and 12.38, _____ would predominate at pH 5 while
_____ would predominate at pH 10.
H3PO4; H2PO4-
H3PO4; HPO42-
,BCH EXAM 1 QUESTIONS AND ANSWERS LATEST DOWNLOADED
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H3PO4; PO43-
H2PO4-; PO43-
H2PO4-; HPO42- - CORRECT ANSWERS H2PO4-; HPO42-
T/F The value of Kw is 1014 M2 at 25°C. - CORRECT ANSWERS false
What is the concentration of hydrogen ions at pH 3?
103 M
10-3 M
3M
0.3 M - CORRECT ANSWERS 10-3M
T/F The pK values for phosphoric acid are 2.15, 6.82, and 12.38. At pH 12.38, [H2PO4-] = [HPO42-] -
CORRECT ANSWERS False
The pK of acetic acid is 4.76. Which statement is true at pH 5.0?
a) [A-] = [HA]
b) [A-] < [HA]
c) [A-] > [HA] - CORRECT ANSWERS c
If the pK values for phosphoric acid are 2.15, 6.82 and 12.38, _____ would predominate at pH 5 while
_____ would predominate at pH 10.
a)H2PO4-; HPO42-
b)H3PO4; H2PO4-
c)H3PO4; HPO42-
d)H3PO4; PO43-
e)H2PO4-; PO43 - CORRECT ANSWERS a
,BCH EXAM 1 QUESTIONS AND ANSWERS LATEST DOWNLOADED
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The side chain of Serine is:
-CH2-CH2-S-CH3.
-CH2-SH.
-CH2OH.
-CH2-CH2-CH2-CH2-NH2.
-CH2COOH. - CORRECT ANSWERS -CH2OH
T/F In aqueous solution amino acids are rarely found in the neutral, unionized form. - CORRECT
ANSWERS True
Which amino acid side chain can form a hydrogen bond?
Alanine
Glycine
Threonine
Isoleucine - CORRECT ANSWERS threonine
Which one of the following sequences of five amino acids would most likely be located in the interior of
a globular soluble protein?
a)Tyr-Phe-Glu-Asn-Leu
b)Val-Ala-Val-Glu-Val
c)Met-Phe-Pro-Ile-Leu
d)Glu-Asn-Ser-Thr-Gln
e)Met-Cys-Pro-His-Tyr - CORRECT ANSWERS c
What is the net charge at pH 7.0 on a peptide with the sequence?
, BCH EXAM 1 QUESTIONS AND ANSWERS LATEST DOWNLOADED
2025/2026 A COMPLETE SOLUTION ALL ANSWERS 100% ACCURATE
BEST RATED TO SCORE A+ FOR SUCCESS
Ala-Thr-Leu-Asp-Ala-Lys-Pro-Glu
+2
+1
0
-1
-2 - CORRECT ANSWERS -1
Which amino acid side chain is NOT aromatic?
Tryptophan
Methionine
Phenylalanine
Tyrosine - CORRECT ANSWERS met
Molecular chaperones assist proteins in the formation of ___.
aggregates
tertiary structure
peptide bonds
primary structure - CORRECT ANSWERS tertiary
If the following mixture of proteins was applied to a size-exclusion chromatography column, what would
be the order of elution?
Proteins with molecular weights: myoglobin (17.7 kDa), hemoglobin (64.5 kDa), lysozyme (14.3 kDa) and
triose phosphate isomerase (57.4 kDa)
a)lysozyme, myoglobin, triose phosphate isomerase, hemoglobin
