Amino Acids Classification and Properties

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Questions and Answers

Name two amino acids with a hydroxyl group in their side chain.

Serine, threonine

Which amino acids have sulfur in their side chain?

Cysteine, methionine

Which amino acids have a benzene ring in their side chain?

Phenylalanine, tyrosine

Name an amino acid with a side chain ring that possesses at least one atom other than carbon.

<p>Tryptophan</p> Signup and view all the answers

What are the key elements found in amino acids?

<p>Carbon, hydrogen, nitrogen, oxygen</p> Signup and view all the answers

Identify an amino acid with an amide group in its side chain.

<p>Asparagine, glutamine</p> Signup and view all the answers

Why is classification of amino acids important?

<p>It gives a clear idea to pick the amino acid type and is useful for biochemists to understand each amino acid.</p> Signup and view all the answers

How many amino acids appear in the genetic code?

<p>20</p> Signup and view all the answers

What are the basic components of an amino acid?

<p>Amine [-NH2], carboxyl [-COOH], side chain [R group]</p> Signup and view all the answers

What are the ways in which amino acids can be classified?

<p>Based on R group, polarity and R group, distribution in protein, nutritional requirements, number of amino and carboxylic groups</p> Signup and view all the answers

Flashcards

Hydroxyl Containing Amino Acids

Amino acids with a hydroxyl group (-OH) in their side chain. They contribute to hydrogen bonding interactions.

Sulfur-Containing Amino Acids

Amino acids containing sulfur (S) in their side chain.

Aromatic Amino Acids

Amino acids possessing a benzene ring (C6H6) in their side chain. These aromatic rings contribute to protein stability.

What are Amino Acids?

The most basic building blocks of proteins.

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How are Amino Acids Classified?

Amino acids can be classified based on the properties of their side chains, such as polarity, charge, and size.

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Basic Amino Acids

Amino acids with positively charged side chains at physiological pH.

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Acidic Amino Acids

Amino acids with negatively charged side chains at physiological pH.

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Nonpolar Amino Acids

Amino acids with nonpolar side chains, meaning they don't interact strongly with water.

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Polar Amino Acids

Amino acids with polar side chains, meaning they interact strongly with water.

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Standard Amino Acids

The 20 amino acids that are encoded by the genetic code and used to build proteins.

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Study Notes

Amino Acids with Specific Side Chains

  • Serine and Threonine contain a hydroxyl (-OH) group in their side chains.
  • Cysteine and Methionine are amino acids that have sulfur in their side chains.
  • Phenylalanine, Tyrosine, and Tryptophan feature a benzene ring in their side chains.
  • Proline is an example of an amino acid with a side chain ring that possesses nitrogen, an atom other than carbon.

Key Elements in Amino Acids

  • Amino acids primarily consist of carbon (C), hydrogen (H), oxygen (O), nitrogen (N), and sometimes sulfur (S).

Amino Acids with Functional Groups

  • Asparagine and Glutamine have an amide group (-CONH2) in their side chains.

Importance of Classification

  • Classification of amino acids is crucial for understanding protein structure and function, biochemical pathways, and metabolic processes.

Genetic Code and Amino Acids

  • There are 20 standard amino acids that appear in the genetic code.

Basic Components of Amino Acids

  • Each amino acid has a central carbon atom, an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom, and a unique side chain (R group).

Classification Methods

  • Amino acids can be classified based on properties such as polarity (polar, non-polar), charge (charged, uncharged), and structure (aromatic, aliphatic).

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