<prompt> Which is an allosteric protein -a Transferrinb Ceruloplasminc Phosphofructokinase d Haemoglobinacbcdd  <response>: Hemoglobin is an allosteric protein, i.e. binding of an allosteric modulator to hemoglobin alter binding of other substrate or molecule i.e. O2.Phosphofructokinase I is an allosteric enzyme and is regulated allosterically in glycolysis. All enzymes except for ribozymes are proteins. So PFK-I is an allosteric protein. 