1.  at pH 7

2.  at their isoelectric points

3.  at pH around 7

2.  Globulins

3.  Albumins

4.  Blood platelets

1.  Albumin

2.  Keratin

4.  Haemoglobin

1.  Lipids

2.  cellular membrane

4.  antibodies

1.  amylose and glycogen

3.  amylopectin and glycogen

4.  glucose and glycogen

1.  C5' and C2' respectively of sugar molecule

2.  C2' and C5' respectively of sugar molecule

4.  C5' and C1' respectively of sugar molecule.

1.  Protein

3.  Simple sugar

4.  All the above

1.  AI

2.  Hg

4.  Cu

1.  A

3.  C

4.  K

1.  Uracil

3.  Guanine

4.  Adenine