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Organic chemistry test study guide notes for amino acids peptides and proteins synthesis of amino acids phosphorus containing compounds concept summary good for mcat prep
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Document Overview: Organic Chemistry Test Study Guide Notes 1. Amino Acids, Peptides, and Proteins This section covers the structure, classification, and properties of amino acids, including essential and non-essential types. It explains peptide bond formation and the significance of protein fol...

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  • September 20, 2024
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-Amino Acids, Peptides,
Organic Chemistry
and Proteins
Test Study Guide: -Synthesis of ∝-Amino
Ch.10 Nitrogen- & Phosphorus- Acids
Containing Compounds -Phosphorus-
Containing Compounds

CONCEPT SUMMARY

Points on Amino Acids, Peptides, and Proteins

Structure of Amino Acids

The α-carbon of an amino acid is central to its structure, bonded to four distinct groups: an amino group (-
NH2), a carboxyl group (-COOH), a hydrogen atom (H), and a variable R group (side chain).
This α-carbon serves as a chiral stereocenter, with the exception of glycine, which has two hydrogen atoms
attached to its α-carbon.

Stereochemistry

In eukaryotic organisms, all amino acids are classified as 1-amino acids.
The majority exhibit (S) stereochemistry; however, cysteine is unique in possessing (R) stereochemistry due to
the presence of its sulfur-containing side chain.

Amphoteric Nature

Amino acids possess amphoteric properties, allowing them to function both as acids and bases.
Their acidic behavior is attributed to the carboxyl group, while their basic characteristics stem from the amino
group.

Zwitterion Formation

In neutral aqueous solutions, amino acids predominantly exist as zwitterions—molecules that carry both
positive and negative charges but are overall electrically neutral.

Classification by R Groups

Amino acids can be categorized based on their R groups:
Nonpolar Nonaromatic Amino Acids: These include alanine, valine, leucine, isoleucine, glycine, proline,
and methionine. They are generally hydrophobic and tend to cluster in the interior of proteins.
Aromatic Amino Acids: Comprising tryptophan, phenylalanine, and tyrosine. Like nonpolar nonaromatic
amino acids, they also exhibit hydrophobic characteristics.

In summary, amino acids are fundamental building blocks of proteins characterized by their unique structures and
properties. Their classification into various categories based on polarity and aromaticity plays a crucial role in
protein folding and function.

Amino Acids and Proteins

1. Types of Amino Acids:

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