Final answer:
The molecule removed during dehydration synthesis is water. This removal helps to form polymers like proteins where a peptide bond joins amino acids together. Therefore, the answer to the question is option c) Water.
Step-by-step explanation:
The molecule removed during dehydration synthesis is water. This process occurs when monomers are joined to form polymers, with the removal of a hydroxyl (OH) group from one monomer and a hydrogen (H) atom from another, resulting in the release of a water molecule.
For example, during peptide bond formation between amino acids, the carboxyl group of one amino acid is linked to the amino group of the incoming amino acid.
This reaction results in the formation of a covalent bond and the release of a molecule of water, thereby building longer chains of proteins known as polypeptides.