Which of the following is NOT a product of a condensation reaction?

A condensation reaction, also known as a dehydration synthesis reaction, involves the joining of two molecules with the removal of a water molecule, leading to the formation of a larger and more complex molecule.

In the context of the options given, the formation of a dipeptide from two amino acids, the synthesis of nucleic acids from nucleotides, and the creation of a polysaccharide from simple sugars are all classic examples of condensation reactions. Each of these examples involves the linkage of smaller units (amino acids, nucleotides, simple sugars) through condensation, resulting in more complex biomolecules while simultaneously releasing water.

In contrast, an increased concentration of solute does not involve the formation of new covalent bonds or complex structures through the removal of water. Instead, it simply refers to a change in the concentration of solute particles in a solution, which is not a product of a condensation reaction. This makes it distinct from the other processes described, which contribute to the synthesis of macromolecules through condensation. Hence, the correct answer indicates that an increase in solute concentration is not a result of a condensation reaction.