Final answer:
The energy to add a uracil to the 3′ end of a transcript comes from the hydrolysis of pyrophosphate from the incoming UTP molecule. Therefore, the correct option is C.
Step-by-step explanation:
A transcript's 3′ end can be nucleated by hydrolyzing the pyrophosphate molecule from the entering UTP molecule. When uracil is added to the expanding RNA chain during transcription, it involves the incoming molecule UTP (uridine triphosphate).
When a phosphate group in UTP is broken during its integration into the RNA chain, pyrophosphate is hydrolyzed, releasing the energy needed for this process. This strenuous process uses energy to guarantee precise and effective RNA molecule creation.
Therefore, the correct option is C.
Your question is incomplete, most probably the complete question is:
Where does the energy come from to add a uracil to the 3′ end of a transcript?
a. The cell’s supply of ATP
b. The hydrolysis of all three phosphate groups from the incoming UTP molecule
c. The hydrolysis of pyrophosphate from the incoming UTP molecule
d. The hydrolysis of a terminal phosphate from the incoming UTP molecule
e. The energu realease by allowing the uracil to complementary base pair with an adjacent thymine