#Question id: 10278
#Unit 6. System Physiology – Plant
The type of ATP synthesis, traditionally referred to as substrate-level phosphorylation involves the direct transfer of a phosphate group, which reactions perform substrate-level phosphorylation?
a) Conversion of Glyceraldehyde 3-phosphate to 1,3-Bisphosphoglycerate
b) Conversion of Phosphoenol pyruvate to pyruvate
c) Conversion of Fructose 6-phosphate to Fructose 1,6-bisphosphate
d) Conversion of 1,3-Bisphosphoglycerate to 3-Phosphoglycerate
Find the correct one.
#Question id: 10279
#Unit 6. System Physiology – Plant
Phosphohexose isomerase is one of the enzyme of glycolysis which catalyzes Glucose 6-phosphate to Fructose 6-phosphate, enzyme bind with the hexose in their active site by opening the structure. The ring opening and closing reactions are catalyzed by an active-site present amino acid such as
#Question id: 10280
#Unit 6. System Physiology – Plant
The enzyme of glycolytic pathway that forms fructose 1,6-bisphosphate is called phosphofructokinase-1 (PFK-1), which statements can’t distinguish it from a second enzyme (PFK-2) Phosphofructokinase-2.
#Question id: 10281
#Unit 6. System Physiology – Plant
Gluconeogenesis is particularly important in plants such as the castor oil plant Ricinus communis and sunflower that store carbon in which form .
#Question id: 10282
#Unit 6. System Physiology – Plant
In the glycolytic reaction one of the step is catalyzed by ATP-dependent phosphofructokinase is essentially irreversible, at the same step which one of the following enzyme used in gluconeogenesis, both of the enzymes are ATP dependent.
#Question id: 10283
#Unit 6. System Physiology – Plant
How to Phosphofructokinase-1 (PFK-1) and Fructose 1,6-Bisphosphatase are reciprocally regulated ?
a) ATP inhibits PFK-1 by binding to an allosteric site and lowering the affinity of the enzyme for its substrate fructose 6-phosphate
b) citrate is also an allosteric regulator of PFK-1, high citrate concentration increases the inhibitory effect of ATP
c) FBPase-1, is strongly inhibited (allosterically) by AMP; when the cell’s supply of ATP is low (corresponding to high AMP), the ATP-requiring synthesis of glucose slows
d) AMP inhibits PFK-1 by binding to an allosteric site and lowering the affinity of the enzyme for its substrate fructose 6-phosphate
Which of the following statements of regulation of enzyme is correct?