Concept explainers
For each amino acid: [1] draw the L enantiomer in a Fischer projection; [2] classify the amino acid as neutral, acidic, or basic; [3) give the three-letter symbol; [4] give the one-letter symbol.
- arginine
- tyrosine
- glutamic acid
- valine
(a)
Interpretation:
The L-isomer of arginine in Fisher projection needs to be drawn and identified as acidic, basic or neutral. The three letter and one symbol for it needs to be determined.
Concept Introduction:
Like monosaccharides, the prefixes D and L are used to designate the arrangement of groups to the chiral center of amino acid, when drawn with a vertical carbon chain having
Amino acids that have the
Answer to Problem 26P
- L isomer of arginine is as follows:
- In arginine, an additional basic nitrogen present. So, it is basic in nature.
- Three-letter symbol for arginine is 'Arg'.
- One letter symbol is 'R'.
Explanation of Solution
Amino acids that have the
To draw the Fisher projection of arginine, place the
at the bottom and to draw L isomer draw
Here, R group is as follows:
In arginine, an additional basic nitrogen present. So, it is basic in nature.
Three-letter symbol for arginine is Arg and one letter symbol is R.
(b)
Interpretation:
The L-isomer of tyrosine in Fisher projection needs to be drawn and identified as acidic, basic or neutral. The three-letter and one symbol for it needs to be determined.
Concept Introduction:
Like monosaccharides, the prefixes D and L are used to designate the arrangement of groups to the chiral centre of amino acid, when drawn with a vertical carbon chain having
Amino acids that have the
Answer to Problem 26P
- L-isomer of tyrosine is as follows:
- Tyrosine is neutral in nature.
- Three-letter symbol for tyrosine is 'Tyr'.
- One letter symbol for tyrosine is 'Y'.
Explanation of Solution
Amino acids that have the
To draw the Fisher projection of tyrosine by placing the
at the bottom and to draw L isomer draw
The overall charge of tyrosine is zero as there is one positive and negative charge. Hence, tyrosine is neutral in nature.
Three-letter symbol for tyrosine is 'Tyr' and one letter symbol is 'Y'.
(c)
Interpretation:
The L-isomer of glutamic acid in Fisher projection needs to be drawn and identified as acidic, basic or neutral. The three-letter and one symbol for it needs to be determined.
Concept Introduction:
Like monosaccharides, the prefixes D and L are used to designate the arrangement of groups to the chiral centre of amino acid, when drawn with a vertical carbon chain having
Amino acids that have the
Answer to Problem 26P
- L-isomer of glutamic acid is as follows:
- Glutamic acid is acidic in nature.
- Three-letter symbol for glutamic acid is 'Glu'.
- One letter symbol for glutamic acid is 'E'.
Explanation of Solution
Amino acids that have the
Draw the Fisher projection of glutamic acid by placing the
In glutamic acid, one additional acidic carboxyl group present. So, glutamic acid is acidic in nature.
Three-letter symbol for glutamic acid is 'Glu' and one letter symbol for glutamic acid is 'E'.
(d)
Interpretation:
The L-isomer of valine in Fisher projection needs to be drawn and identified as acidic, basic or neutral. The three-letter and one symbol for it needs to be determined.
Concept Introduction:
Like monosaccharides, the prefixes D and L are used to designate the arrangement of groups to the chiral centre of amino acid, when drawn with a vertical carbon chain having
Amino acids that have the
Answer to Problem 26P
- L-isomer of valine is as follows:
- Valine is neutral in nature.
- Three-letter symbol for valine is 'Val'.
- One letter symbol for valine is 'V'.
Explanation of Solution
Amino acids that have the
Draw the Fisher projection of valine by placing the
The net charge in valine is zero as there is one positive charge and negative charge in the compound. So, valine is neutral.
Three-letter symbol for valine is 'Val' and one letter symbol for valine is 'V'.
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Chapter 21 Solutions
GEN ORG + BIO (LL) W/CONNECT
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- Estimate the pI of each tripeptide in Problem 27.46. Draw a structural formula of these tripeptides. Mark each peptide bond, the N-terminal amino acid, and the C-terminal amino acid. (a) Phe-Val-Asn (b) Leu-Val-Glnarrow_forwardWhich amino acids could be referred to as derivatives of butanoic acid?arrow_forwardWhat is signified when an amino acid is designated as an -amino acid?arrow_forward
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