1.4.1 - general properties of proteins

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Last updated 4:04 PM on 9/16/26
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9 Terms

1
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Describe and draw the general structure of an amino acid

  • COOH - carboxyl group

  • R - variable side group/ chain

  • H2N- amine group


2
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How many amino acids are common in all organisms and how do they differ?

20 - different only in there side group

3
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Describe how amino acids join together

  • condensation reaction

  • Removing a water molecule

  • Between carboxylate/ COOH grou of one and amine/ H2N group of another

  • Forming a peptide bond


4
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What are dipeptides and polypeptides

Dipeptide - 2 amino acids joined together

Polypeptide - many amino acids joined together

5
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How many polypeptides in a functional protein?

One or more

6
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Describe the primary structure of a protein

Sequence of amino acids in a polypeptide chain, joined by peptide bonds


7
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Describe the secondary structure of a protein

  • folding of polypeptide chain into alpha helix or beta pleated sheet

  • Maintained by hydrogen bonds between NH group of one amino acids and C=O group of another


8
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Describe the tertiary structure of a protein

  • 3D folding of polypeptide chain

  • Maintained by hydrogen and ionic bonds and disulphide bridges between R groups of amino acids


9
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