Molecules of Life: Macromolecules

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Presentation transcript:

Molecules of Life: Macromolecules Proteins

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

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

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)

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.

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

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