B2 Proteins Flashcards
Name the monomer shown in the diagram
Amino acid
Name the elements found in an amino acids
Carbon
Hydrogen
Oxygen
Nitrogen
Name the bond formed between two amino acids
Peptide bond
Name the type of reaction used to break a peptide bond
Hydrolysis
Name the level of protein structure shown in the diagram
Primary structure
Define primary structure of proteins
Specific sequence of amino acids joined by peptide bonds
Name the type of reaction used to join two amino acids together
Condensation reaction
How is this secondary structure held in place?
Hydrogen bonds
Name the type of secondary structure shown on the diagram
Alpha helix
Name the type of secondary structure shown on the diagram
Beta pleated sheet
Give a definition of secondary structure
Specific folding of the primary structure held in place by hydrogen bonds
Give a definition of tertiary structure
Specific folding of the secondary structure held in place by hydrogen, ionic and disulfide bonds
Name a protein that has a tertiary structure
Enzyme
Name a protein that has a quaternary structure
Haemoglobin
Antibody
Chlorophyll
Give a definition of a quaternary structure
Protein made of two or more polypeptides
What is a disulfide bridge?
A bond between 2 sulfur atoms
Which amino acid contains sulfur?
Cysteine
Name the three parts of an amino acid
NH3 - amine group
COOH - carboxyl group
R group - variable side chain
Describe how a dipeptide is formed
Condensation reaction
Form a peptide bond between 2 amino acids
Hydrogen removed from NH3 group
Hydroxyl group removed from the carboxyl group
What is a polypeptide?
Many amino acids joined together by peptide bonds
Describe a biochemical test for a protein
Biuret test
Add Biruet solution
Positive result - lilac
Negative result - blue
Nmae the organelle responsible for joining amino acids together
Ribosome
