Question

Fill in the blanks in the following diagram representing sucrose synthesis in plants.

Short answer

Answer:

A: UDP-glucose + Fructose-6-phosphate

B: Sucrose Phosphate

Step-by-step solution

Definition of Sucrose  

Sucrose is a type of sugar that occurs naturally and is found in various products like fruits, vegetables, and nuts.

Function of Sucrose in plants.  

In the plants, sucrose is the major source of carbon skeletons and energy for that type of organ of plants that are unable to perform photosynthesis. For example, sink organs

Steps in sucrose synthesis

UDP-glucose and fructose 6-phosphate, are the building ingredients of sucrose metabolism which occur in two phases.

Sucrose 6-phosphate synthase catalyzes the reversible transfer of the sugar moiety of UDP-glucose to fructose 6-phosphate to generate sucrose 6-phosphate in the first step.

In irreversible hydrolysis catalyzed by sucrose-phosphate phosphatase, sucrose 6-phosphate is dephosphorylated to sucrose.