Consider a protein with the acidic side chains, Amino Acid side-chain Arginine pKa = 12.48
Aspartic Acid PKa = 3.90
Cysteine pKa = 8.33

Glutamic acid pKa = 4.07
Histidine pKa = 6.04
Lysine pKa =10.79
Tyrosine pKa =10.13
Given that the pH of blood is about 7.3, how many of the above side chains would be mostly in their ionic form (A-) in blood?
1. 2
2. 3
3. 4
4. 5

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.