BIOLOGY
AMINO ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following statements about standard amino acids are correct?P. Lysine has butylammonium side chain.Q. Average mass of an amino acid residue is 110 Da.R. Universal genetic code specifies only the 22 standard amino acids.S. Proline has a secondary amino group.
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P and Q
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Q and S
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P, Q, R and S.
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Only Q and R.
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Explanation:
Detailed explanation-1: -So, the correct option is ‘Lysine and arginine are acidic amino acids. ‘
Detailed explanation-2: -All amino acids except glycine are optically active.
Detailed explanation-3: -(D) In -amino acids, the basic group is (−COO⊖) and acidic group is (−N⊕H3). -amino acids exists in the form of zwitter ions in which carboxylic group is deprotonated and amino group is deprotonated.
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