Phosphoglyceraldehyde and dihydroxyacetone phosphate areA. IsomersB. PolymersC. TautomersD. Synonyms

The correct answer is A. Isomers.

Explanation:

Phosphoglyceraldehyde (PGAL) and dihydroxyacetone phosphate (DHAP) are both three-carbon molecules involved in the glycolysis pathway. They have the same molecular formula (C3H7O6P), but their structures are different. PGAL is an aldehyde, while DHAP is a ketone. These molecules are considered isomers because they have the same chemical formula but different structural arrangements.

Isomers are compounds that have the same molecular formula but differ in the arrangement of atoms.
Polymers are large molecules made by repeating smaller units called monomers.
Tautomers are isomers that differ in the position of a proton and the double bond.
Synonyms refer to different names for the same compound, but PGAL and DHAP are not different names for the same substance—they are distinct molecules.
Thus, PGAL and DHAP are isomers.