Protein structure

Protein

Amino Acids

Atoms:

O

H

Oxygen

Hydrogen

CarbonC

NitrogenN

Protein structure

Protein

Amino Acids

Atoms:

O

H

Oxygen

Hydrogen

CarbonC

NitrogenN

C HO H

C ON

NH

C HO H

C ON

NH

C HO H

C ON

NH

C HO H

C ON

NH

C HO H

C ON

NH

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 chainthe 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?

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

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

What is the process the body uses to create the energy we need?

O2 + C6H12O6 CO2 + H2O + energyCellular RespirationCheck your answer here

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

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 colourto violet

Homework

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