Small ions in biological fluids: A) encourage strong electrostatic interactions between oppositely charged macroions at low ionic strengths. B) encourage strong electrostatic interactions between oppositely charged macroions at high ionic strengths. C) have no effect on the interactions between oppositely charged macroions. D) tend to cluster around macroions of the same charge. E) have large effects on pH.

Explanation:

Ions are such types of the species that have a positive charge or negative charge and have the ability to attract in the case of opposite charges and repel in the case of the same charges.

When the ionic strength of the solution is low, then small ions interact with macroions strongly and thus cause strong electrostatic interaction in the biological fluids. The concentration of the ions that are present in the solution is known as the ionic strength of the solution. Ions play an important role in biological reactions and thus in living organisms.