Just like phospholipid molecules, cholesterol molecules have hydrophobic and hydrophilic regions, Molecules of cholesterol are used to produce steroid-based hormones such as oestrogen, testosterone and progesterone. Cholesterol affects the fluidity and permeability of the cell membrane
What are the monomers for a protein?
amino acids
What elements are found in proteins?
C, H, O, N, and S
What foods contain protein?
meat, fish, eggs
What is the use of protein in the body?
growth and repair
What is the food test for proteins?
Biurets
There are 20 different amino acids
All amino acids have the same basic structure. The R groups are variable groups- a range of chemical groups- different amino acids have different R groups.
red= amino group
green= R variable group
blue= carboxyl group
Amino acids join by condensation reactions. This process forms peptide bonds and releases a molecule of water.
two amino acids joining via a condensation reaction, and forming a peptide bond, results in a dipeptide. When many amino acids are joined by peptide bonds a polypeptide is formed. Proteins consist of one or more polypeptides arranged as complex macromolecules.
Breakdown of dipeptides and polypeptides requires breakage of peptide bonds through a hydrolysis reaction. Proteases are enzymes which catalyse the hydrolysis reaction
