AP BIOLOGY

Detailed explanation-1: -D Triosephosphate Isomerase . Triosephosphate isomerase (TIM) catalyzes the interconversion of d-glyceraldehyde-3-phosphate (G3P) and dihydroxyacetone phosphate (DHAP).

Detailed explanation-2: -Glycolysis Enzymes : Example Question #2 As the name suggests, this enzyme catalyzes the isomerization of a three-carbon sugar into another three-carbon sugar. Since the molecular formulas of DHAP and G3P are the same, we know that they are isomers of each other.

Detailed explanation-3: -Dihydroxyacetone phosphate lies in the glycolysis metabolic pathway, and is one of the two products of breakdown of fructose 1, 6-bisphosphate, along with glyceraldehyde 3-phosphate. It is rapidly and reversibly isomerised to glyceraldehyde 3-phosphate.

Detailed explanation-4: -Fructose-1, 6-bisphosphate splits to form two three-carbon sugars: dihydroxyacetone phosphate (DHAP) and glyceraldehyde-3-phosphate. They are isomers of each other, but only one-glyceraldehyde-3-phosphate-can directly continue through the next steps of glycolysis. DHAP is converted into glyceraldehyde-3-phosphate.

Detailed explanation-5: -Isomerization of Dihydroxyacetone Phosphate to Glyceraldehyde-3-Phosphate. In this reversible reaction, triose-phosphate isomerase converts dihydroxyacetone phosphate to D-glyceraldehyde-3-phosphate, which is the substrate for the next reaction.