Structure and Properties of Amino Acids – Section 1

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16. Protein fluorescence arises primarily from which residue?

A. Arginine
B. Tryptophan
C. Tyrosine
D. Phenylalanine

Correct Answer: B. Tryptophan

17. Which of the following amino acid is known as half-cystine residue?

A. Cysteine
B. Isoleucine
C. Valine
D. Histidine

Correct Answer: A. Cysteine

18. Which of the following is not an essential amino acid?

A. Aspartic acid
B. Glutamic acid
C. Glycine
D. All of these

Correct Answer: D. All of these

19. Which of the following is not a sensible grouping of amino acids based on their polarity properties?

A. Ala, Leu, and Val
B. Arg, His, and Lys
C. Phe, Trp, and Tyr
D. Asp, Ile, and Pro

Correct Answer: D. Asp, Ile, and Pro

20. Proteins and macromolecular structures take on their higher order structures

A. by self-assembly
B. with the help of molecular chaperons
C. with the help of precursor sequences that are removed from the final structures
D. all of the above

Correct Answer: D. all of the above
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