Haemoglobin

What is the name of the molecule formed when oxygen binds to haemoglobin?

• oxyhaemoglobin

• oxygen-haemoglobin

• carbaminohaemlobin

• oxyglobin

The ion found in the haem group is what

• Mg²⁺

• O^2-

• Fe²⁺

• Fe³⁺

When carbon dioxide binds directly with haemoglobin it forms

• carbaminohaemoglobin

• carboxyhaemoglobin

• carbon diooxyhaemoglobin

• carboglobin

1  The tertiary structure of a protein is the

• bonding together of several polypeptide chains by weak bonds.
• order in which amino acids are joined in a peptide chain.
• twisting of a peptide chain into an α-helix.
• three-dimensional shape.

1  At which level of protein structure are interactions between R groups most important?

• primary
• secondary
• tertiary
• quaternary

Haemoglobin is present in ______________________cells.

• white blood cells

• red blood cells

• plasma

• platelets

Which of the following is NOT the structure of haemoglobin?

• Each haemoglobin molecule contains 4 haem group

• Haemoglobin is a quaternary structure

• Every each haem group in haemoglobin can bind with 4 molecule of oxygen

• Each haemoglobin has 2 α-chain and 2 β-chain polypeptide subunits

Which of the following is FALSE concerning the haemoglobin molecule?

• It contains amino acids.

• It contains iron.

• It is composed of four polypeptide chains.

• It is found in humans only.

Each haemoglobin molecule can bind reversibly with

• one atom of oxygen

• one molecule of oxygen

• two molecules of oxygen

• four molecules of oxygen

1  The correct shape of a globular protein is maintained by several types of bond.   
1 = disulfide 2 = hydrogen 3 = ionic 
4  = peptide  
Which bond types are involved in maintaining the different levels of structural complexity of a globular protein?

• Primary: 4 
  Secondary:3
   Tertiary:1,2,3
• Primary: 2 
  Secondary:1
   Tertiary:2,3,4
• Primary: 2 
  Secondary:4
   Tertiary:2,3,4
• Primary: 4 
  Secondary:2
   Tertiary:1,2,3