E-PolyLearning

11. Serine and threonine are polar amino acids due to
a. reactive hydroxyl group in the side chain
b. reactive alcoholic group in the side chain
c. reactive keto group in the side chain
d. reactive aldehyde group in the side chain
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Answer: (a).reactive hydroxyl group in the side chain

12. Which of the following is not the hydrophobic and aromatic amino acid?
a. Phenylalanine
b. Tyrosine
c. Tryptophan
d. None of these
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Answer: (d).None of these

13. Stereo chemical configuration of all a-amino acids derived from proteins is
a. L
b. D
c. L and D
d. None of these
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Answer: (a).L

14. What is the product of the catabolic breakdown of Alanine?
a. Fumarate
b. Oxaloacetate
c. Pyruvate
d. Malate
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Answer: (c).Pyruvate

15. How many different amino acids are there?
a. 3
b. 20
c. 100
d. An infinite number
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Answer: (b).20

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