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Key Questions:
•What are the major chemicals in living things?
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1. Characteristics of Proteins
•Proteins are organic molecules. They contain carbon, hydrogen, oxygen and nitrogen , and sometimes sulfur.
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2. Examples of Proteins• What parts of people
are mostly made of protein?
1. ________________2. ________________3. ________________
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1.Muscle
2.Hair
3.Nails
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•Did you eat any protein for breakfast?
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•Food Sources of Protein
•Meat: Beef, Pork, Poultry, Seafood•Dairy products (milk cheese, yogurt, cottage cheese)•Beans •Nuts•Soy beans and tofu
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Why do we need protein in our diets?
•Our bodies cannot make all the amino acids needed.
•We need to get 8 amino acids from our diet
•We call these the 8 essential amino acids
8 essential amino acids
• Isoleucine• Leucine• Lysine• Methionine• Phenylalanine• Threonine• Tryptophan• Valine
• Muscles• Blood, Muscles, Hormones• Herpes, triglycerides• Hair, skin• Depression• Collagen, tooth enamel• Depression• muscles
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•Plant material does not contain the 8 essential amino acids
•People who are vegetarians must eat a combination of beans and rice to obtain all the essential amino acids
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3. Uses of Proteins•Structural-
They serve as the building and binding materials of living things.
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•Most cell structures are made from proteins
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•Growth and Repair
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•Transporting material
•Ex. Hemoglobin transports oxygen in blood cells
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•Movement
•Ex. Collagen is a protein that forms tendons, ligaments, and cartilage
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• Enzymes• Control
rate of reaction and regulate cell processes
• Ex. Insulin lowers blood sugar
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• A catalyst that lowers the amount of energy needed for a reaction to occur.
• Almost every cellular reaction has an enzyme
What happens if you don’t have a certain enzyme?
• If you are lacking an enzyme, you aren’t able to break down certain proteins.
• For example, if you are lactose intolerant, you are missing the enzyme lactase.
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4. Structure of Proteins• Building blocks are amino
acids.• There are over 20 different
amino acids.
• Cells combine amino acids in different ways to form thousands of different
proteins.
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• Macromolecules –ProteinsAmino acids form chains that can fold and spiral and make complex protein structures.
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• General Design
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5. Unique Property of Proteins
•How are the amino acids in proteins like letters in a word?
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•How many letters in the alphabet? ____
•Letters make _____•Words can be big or little.
•Unlimited # of words.
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•How many amino acids? ____
•Amino acids make _______•Proteins can be big or little.•Unlimited # of _________
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Making Connections
On the side of a Diet Coke can it says WARNING: Contains Phenylalanine. Why would a person need to worry about an increase of an essential amino acid in their diet?
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