Protein structure Oxygen Hydrogen Carbon Nitrogen Atoms: Amino Acids

Protein structure Oxygen Hydrogen Carbon Nitrogen Atoms: Amino Acids

Foods: meat, fish, milk, cheese, peanuts, dry beans, peas 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

Functions of Protein

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? Click to reveal 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.

Proteins Click to reveal There are 20 amino acids. 8 are considered essential, obtained in diet. Click to reveal 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.

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

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

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

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

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