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6. What is the heaviest of the twenty amino acids?
a. Phenylalanine
b. Tryptophan
c. Tyrosine
d. Histidine
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Answer: (b).Tryptophan

7. Which of the following amino acids can form hydrogen bonds with their side (R) groups?
a. Asparagine
b. Aspartic acid
c. Glutamine
d. All of these
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Answer: (d).All of these

8. The isoelectric point of an amino acid is defined as the pH
a. where the molecule carries no electric charge
b. where the carboxyl group is uncharged
c. where the amino group is uncharged
d. of maximum electrolytic mobility
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Answer: (a).where the molecule carries no electric charge

9. The sulphur containing side chain of cysteine is
a. ampiphillic, highly reactive and capable of reacting with another cysteine
b. hydrophillc, highly reactive and capable of reacting with another cysteine
c. hydrophobic, highly reactive and capable of reacting with another cysteine
d. none of the above
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Answer: (c).hydrophobic, highly reactive and capable of reacting with another cysteine

10. Which of the following is a nonprotein amino acid?
a. Dopamine
b. Hydroxylysine
c. Cystine
d. None of these
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Answer: (a).Dopamine

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