An antibody binds its antigen and is allowed to reach equilibrium. At equilibrium, the following concentrations are found:
Free antibody (not bound) is 0.2uM
Antibody:antigen complex is 100uM
Unbound antigen is 0.4uM

What is the Kd for this antibody to bind to this antigen?

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.

we need the questions , i may then you.

the dissolution of polymer can be thermodynamically described in 2 steps.

i think its 100

i hope this !