proteins

• what are the main components of proteins


  carbon , hydrogen , oxygen .nitrogen and most of the time sulphur and phosphorous
• list the functions of proteins

  enzymes , antibodies, hormones , structural and carrier or transport proteins
• what is kertain


  a structural protein in the hair and nails
• what is collagen


  Fibrous protein that gives the skin form and strength
• what are amino acids


  monomers of proteins
• How many amino acids are there?


  20
• what three groups make up proteins

  amino group variable group and a carboxyl group
• what does an amino acid display formula look like

  
• What determines the shape of a protein?

  sequence of amino acids
• what bond is formed when two amino acids bond together through a condensation reaction


  a peptide bondSee an expert-written answer!We have an expert-written solution to this problem!
• where is the peptide bond in a dipeptide


  between the end carbon and the nitrogen atom
• What is a dipeptide?


  2 amino acids joined by a peptide bond
• how are dipeptides broken down


  by a hydrolysis reaction
• what is a hydrolysis reaction


  A bond is broken by adding a molecule of water.
• what are polypeptides


  Long strands of amino acids.
• what are the four structures of proteins


  primary, secondary, tertiary, quaternary
• What is the primary structure of a protein?


  sequence of amino acids in a polypeptide chain
• what are the type of bonds in a polypeptide chain


  peptide bonds
• what is the secondary structure of a protein


  this is a primary structure that is shaped by hydrogen bonds
• where do the hydrogen bonds form in a secondary structure


  amine (n-h) and carboxylic (c-o)
• what are the two types of protein secondary structures

  alpha helix and beta pleated sheet
• what does a alpha helix look like

  
• what does a beta pleated sheet look like

  
• What is tertiary structure of proteins

  3d structure of the polypeptide chains held together by the interactions between some of the variable groups of amino acids
• what bonds are in a tertiary structure of proteins


  ionic bonds , hydrogen bonds , disulphide bonds , and hydrophobic interactions
• What is the quaternary structure of a protein?

  a combination of two or more polypeptide chains each in tertiary form , held together by interactions between variable groups
• what is an example of a quaternary structure

  hemoglobin
• what two groups can proteins be classed as

  a fibrous or globular protein
• what are fibrous proteins


  structural proteins
• what is the structure of a fibrous protein

  alpha helix rope like structure

  
• what are examples of fibrous proteins

  collagen and keratin
• what are the properties of fibrous proteins


  insoluble in water , strong and tough
• What are globular proteins?

  a spherical molecule in a tertiary structure
• what are the functions of globular proteins

  enzymes antibodies plasma proteins and hormones
• what are the properties of globular proteins

  soluble in water
• what is meant by amphoteric

  it can act as an acid ,base or as a buffer