BCH 361 IClicker Questions Study Questions with 100% Correct Verified Solutions| Latest Update
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Module
BCH 361
Institution
BCH 361
The titration curve of phosphoric acid is shown on the right. Which pH is not within the
buffering range of phosphoric acid and its conjugate bases?
A. 2.0
B. 4.0
C. 7.2
D. 12.4 - Answer B. 4.0
BCH 361 IClicker Questions Study Questions
with 100% Correct Verified Solutions| Latest
Update
The titration curve of phosphoric acid is shown on the right. Which pH is not within the
buffering range of phosphoric acid and its conjugate bases?
A. 2.0
B. 4.0
C. 7.2
D. 12.4 - Answer B. 4.0
All amino acids contain an amino (-NH2) and a carboxyl(-COOH) group. The pKa of the
amino group is 9. The pKa of the carboxyl group is 4. What are their protonation states
at pH 7.4?
A. The amino group is protonated/acid form (-NH3+) and the carboxyl group is
deprotonated/base form (-COO-)
B. The amino group is deprotonated/base form (-NH2) and the carboxyl group is
deprotonated/base form (-COO-)
C. The amino group is protonated/acid form (-NH3+) and the carboxyl group is
protonated/acid form (-COOH)
D. The amino group is deprotonated/base form (-NH2) and the carboxyl group is
protonated/acid form (-COOH) - Answer A. The amino group is protonated/acid form (-
NH3+) and the carboxyl group is deprotonated/base form (-COO-)
Is glycine's Cα a chiral center?
,A. Yes
B. No
C. Maybe - Answer B. No
What is the charge on aspartic acid at pH 7.4? pKa of an amine is ~ 9 and pKa of a
carboxyl is ~ 4.
A. -1
B. 0
C. +1
D. +2 - Answer A. -1
Which of the following amino acid is a polar amino acid?
A. A (Leucine)
B. B (Serine)
C. C (Methionine)
D. D (Phenylalanine) - Answer B. Serine
Which of the following statements about amino acids is true?
A. Side chains of amino acids are not charged
B. Human cells can produce all the amino acids they need
C. All aromatic amino acids are hydrophobic amino acids
D. Glutamate is a flavor enhancer - Answer D. Glutamate is a flavor enhancer
, Which of the structures is the correct depiction of a peptide bond?
A. A
B. B
C. C
D. D - Answer IDK
Wis the net charge of the peptide NH2-Ala-Pro-Lys-Gln-Arg-Asp-Gly-COOH at pH 7.4?
A. -1.0
B. 0
C. +1.0
D. 2.0 - Answer C. +1.0
The receptor binding domain of the spike protein inSARS-COV-2 α variant contains the
sequenceGly-Ser-Thr-Pro-Cys-Asn-Gly-Val-Glu The same segment in the Omicron variant
is Gly-Asn-Lys-Pro-Cys-Asn-Gly-Val-Ala What is the charge on each peptide?
A. α: -1 , o: -1
B. α: 0 , o: -1
C. α: -1 , o: +1
D. α: +1 , o: 0 - Answer C. α: -1 , o: +1
According to the Ramachandran plot on the right, which of the following Φ & Ψ angle
combination is not possible for glycine?
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