During glycolysis, phosphofructokinase converts fructose 6-phosphate (F6P) into fructose 1,6-bisphosphate (F1,6BP), as shown below. Aldolase then converts F1,6BP into glyceraldehyde 3-phosphate (GAP) and dihydroxyacetone phosphate (DHAP).Respectively, phosphofructokinase and aldolase are examples of:A.an isomerase and a hydrolase.B.a transferase and a lyase.C.a ligase and an isomerase.D.an oxidoreductase and a transferase.
Question
During glycolysis, phosphofructokinase converts fructose 6-phosphate (F6P) into fructose 1,6-bisphosphate (F1,6BP), as shown below. Aldolase then converts F1,6BP into glyceraldehyde 3-phosphate (GAP) and dihydroxyacetone phosphate (DHAP).Respectively, phosphofructokinase and aldolase are examples of:A.an isomerase and a hydrolase.B.a transferase and a lyase.C.a ligase and an isomerase.D.an oxidoreductase and a transferase.
Solution
Phosphofructokinase and aldolase are examples of a transferase and a lyase, respectively. Therefore, the correct answer is B. a transferase and a lyase.
Here's why:
-
Phosphofructokinase is an enzyme that catalyzes the transfer of a phosphate group from ATP to fructose 6-phosphate in the glycolysis pathway. This classifies it as a transferase, which is a type of enzyme that helps transfer a functional group from one molecule to another.
-
Aldolase, on the other hand, is an enzyme that catalyzes the cleavage of fructose 1,6-bisphosphate into glyceraldehyde 3-phosphate and dihydroxyacetone phosphate. This reaction involves the breaking of a carbon-carbon bond, which classifies aldolase as a lyase. Lyases are enzymes that catalyze the breaking of various chemical bonds by means other than hydrolysis and oxidation.
Similar Questions
Phosphofructokinase-1 converts Fructose 6-phosphate to Fructose 1,6- bisphosphate. Which statement about the reaction is CORRECT? Under anaerobic conditions, this reaction plays an important role in regenerating NAD+ for use in the “pay-off” phase of glycolysis. This reaction occurs in the cytoplasm and is performed by an enzyme shared between glycolysis and gluconeogenesis. This is a readily reversible reaction which is allosterically regulated by Fructose 1,6- bisphosphate. The bifunctional PFK-2/FBPase-2 enzyme controls the concentration of the allosteric regulator of this reaction.
Glucose units cleaved from glycogen by the phosphorylase:Group of answer choicesneed to have their 1-phosphate moved to the C6 position before they can enter glycolysisare converted into fructose 1-phosphate and then enter glycolysis at step 3directly enter glycolysis at step 2, where they are converted to fructose 6-phosphateare phosphorylated at the C1 position by hexokinase to generate glucose 1-phosphate
Most of the enzymes of glycolysis are reversible. But three are not and these are:Select one alternative:phosphofructokinase, fructose 1,6-bisphosphatase, and glucose 6-phosphatasepyruvate socratase, isosolase and fructose 1,6-pythagorasepyruvate kinase, phosphofructokinase and hexokinasepyruvate carboxylase, phosphoenolpyruvate carboxykinase and fructose 1,6-bisphosphatase
Parmi les enzymes suivantes de la glycolyse lesquelles sont soumises a un contrôle allostérique? 1-t'hexokinase 2-La phosphorlycerate kinase 3-La phosphofructokinase-1 4-La triose phosphate isomérase 5-la fructose 1,6 bisphosphate aldolase
An enzyme used in gluconeogenesis but NOT glycolysis is:Group of answer choicesglucose 6-phosphatasephosphofructokinase-1pyruvate kinasehexokinase
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.