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Molecules of Life: Macromolecules

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Presentation on theme: "Molecules of Life: Macromolecules"— Presentation transcript:

1 Molecules of Life: Macromolecules
Proteins

2 Protein What is the subunit of proteins? Amino acids
Which organic molecule contains NITROGEN (in addition to carbon, hydrogen and oxygen)? Protein What is the subunit of proteins? Amino acids

3 What are 3 roles of proteins in the cell?
Proteins account for differences in cells (hair, feathers or scales). Structural proteins Proteins speed up chemical reactions Enzymes Proteins act as body regulators Hormones

4 Twenty How many different kinds of amino acids are there?
How does one protein differ from another? (Two ways) 1. Different numbers of amino acids Protein #1 (three amino acids) Protein # 2 (five amino acids)

5 How does one protein differ from another? (Two ways)
2. Different sequence of amino acids AA Sequence #1 Green-red-yellow-purple-orange AA Sequence #2 Red-yellow-green-orange-purple Different sequence of amino acids = different proteins.

6 Typical number of AA in most proteins? 100
What is the number of possible combinations with just 3 amino acids in the protein? 3 8,000 proteins 20 (number of AA in the protein (number of letters in the protein alphabet) (20) = 8,000 Typical number of AA in most proteins? 100

7 What determines the function of a protein?
Its shape What determines the shape of the protein? Sequence of Amino Acids

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