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Biochemistry
H2C „CH

H2C „CH

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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Is this --

 

A. L-Phenylalanine

B. D-Phenylalanine

C. None of the ahove

The image depicts the chemical structure of the amino acid phenylalanine. Below is a detailed description of each component of the structure: 1. **Benzene Ring**: The right side of the structure features a six-carbon benzene ring, represented as a hexagon with alternating double bonds. This is the aromatic side chain characteristic of phenylalanine. 2. **Amino Group (\(+\text{H}_3\text{N}\))**: On the left of the central carbon, there is an amino group. The nitrogen atom is bonded to three hydrogen atoms. The positive charge next to the nitrogen indicates that it is protonated. 3. **Carboxylate Group (\(\text{C}\text{O}_2^-\))**: The top-left side of the central carbon is bonded to a carboxylate group. The carbon is double bonded to one oxygen atom and single bonded to another oxygen atom which carries a negative charge, indicating that the carboxyl group is deprotonated (in its ionized form). 4. **Central Alpha Carbon**: The central point of the structure is the alpha carbon, which bonds to the amino group, carboxylate group, hydrogen atom, and the benzene ring. 5. **Hydrogen (H)**: There is a single hydrogen atom bonded to the central carbon. This structural representation allows for the illustration of phenylalanine’s characteristics as both an amino acid and an aromatic compound. Such visualization is crucial for understanding the properties and function of phenylalanine in biochemical processes.
Transcribed Image Text:The image depicts the chemical structure of the amino acid phenylalanine. Below is a detailed description of each component of the structure: 1. **Benzene Ring**: The right side of the structure features a six-carbon benzene ring, represented as a hexagon with alternating double bonds. This is the aromatic side chain characteristic of phenylalanine. 2. **Amino Group (\(+\text{H}_3\text{N}\))**: On the left of the central carbon, there is an amino group. The nitrogen atom is bonded to three hydrogen atoms. The positive charge next to the nitrogen indicates that it is protonated. 3. **Carboxylate Group (\(\text{C}\text{O}_2^-\))**: The top-left side of the central carbon is bonded to a carboxylate group. The carbon is double bonded to one oxygen atom and single bonded to another oxygen atom which carries a negative charge, indicating that the carboxyl group is deprotonated (in its ionized form). 4. **Central Alpha Carbon**: The central point of the structure is the alpha carbon, which bonds to the amino group, carboxylate group, hydrogen atom, and the benzene ring. 5. **Hydrogen (H)**: There is a single hydrogen atom bonded to the central carbon. This structural representation allows for the illustration of phenylalanine’s characteristics as both an amino acid and an aromatic compound. Such visualization is crucial for understanding the properties and function of phenylalanine in biochemical processes.
Expert Solution
Step 1

The stereoisomerism means the compound have same molecular constitution but their arrangement in space is different. They are of two types enantiomers and diastereomers.

The D and L configuration belongs to enantiomers category. Enantiomers are the compounds that can not be superimposed on each other but are mirror images of each other.

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