1. Protein structure Atoms: Oxygen Amino Acids O Hydrogen H Carbon Protein C Nitrogen N

2. Protein structure Atoms: Oxygen Amino Acids N O H H C O H C O N Hydrogen H Carbon Protein N N O N O H H H N H O H C H O C H O H H O C H C C O C H C O H C N N N N C Nitrogen N

3. Proteins proteins are unbranched repeating chains of amino acids (a.a) an a.a. are small molecules consisting of an amino group, a carboxyl 

 
group, a carbon and hydrogen atom and a side chain the structure of the side chain distinguishes it from the other 20 a.a. Foods: meat, fish, milk, cheese, peanuts, dry beans, peas

4. Functions of Protein

5. What does the body do with the Proteins we eat? Our digestive system breaks down food into individual molecules for our body to use. What does the body do with Protein? Proteins are broken down into amino acids; the body 
rearranges amino acids to create our own proteins. 
Use proteins for an energy source when other 
nutrients are low. Click to reveal

6. Proteins There are 20 amino acids. 8 are considered essential, obtained in diet. Individuals should not rely on protein as an energy source since proteins cannot be stored in the same manner as carbs - if the body demands a.a. it will begin to digest proteins leading to serious tissue damage. Click to reveal

7. What is the process the body uses to 
create the energy we need? Cellular Respiration Check your answer here O2 + C6H12O6 CO2 + H2O + energy

8. Denatured Proteins Proteins may lose their shape if they are subjected to high temperatures (generally over 40 0C) or exposed to acidic, basic, salty conditions A denatured protein cannot carry out its biological functions  Dangerous  - fevers denature critical enzymes in the brain, leading to seizures and possibly death Click to reveal

9. 1 Testing for Proteins Copy - Biuret reagent reacts with the bonds that join amino acids together - if protein is present solution will react with Biuret's and change colour to violet

10. Homework pg. 278 #1, 2 pg. 280 #1~3 pg. 343 #1~3

11. Denaturation Proteins may lose their shape if they are subjected to high 
temperatures (generally over 40 0C) or exposed to acidic, basic, salty conditions A denatured protein cannot carry out its biological functions  Dangerous  - fevers denature critical enzymes in the brain, leading to seizures and possibly death  Helpful  - curing meat in salt denatures the enzymes in bacteria   that would cause it to spoil  - temporarily straightening hair  - chewing meat