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16. Amino acids required in the human diet and not synthesized by the body are called
a. specialized
b. trace
c. essential
d. accessory
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Answer: (c).essential

17. Which of the following amino acid contain an imidazolium moiety?
a. Alanine
b. Valine
c. Cysteine
d. Histidine
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Answer: (d).Histidine

18. The sequence of letters 'WYQN' will represent
a. Tryptophan, tyrosine, glutamic acid, asparagine
b. Tryptophan, tyrosine, glutamine, asparagine
c. Tryptophan, glutamine, tryptophan, asparagine
d. Glutamine, tyrosine, tryptophan, aspartic acid
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Answer: (b).Tryptophan, tyrosine, glutamine, asparagine

19. Molecules that bear charged groups of opposite polarity are known as
a. zwitterions
b. ambions
c. ion conversion
d. amphions
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Answer: (a).zwitterions

20. What is the product of the catabolic breakdown of Arginine?
a. Alpha-ketoglutarate
b. Fumarate
c. Oxaloacetate
d. Succinate
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Answer: (a).Alpha-ketoglutarate

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