A biochemist is analyzing an aqueous solution of a pure unidentified macromolecule that she isolated from the cytosolic fraction of plant cells.After adding an enzyme that catalyzes the breaking of phosphodiester bonds, she observes that the macromolecule disappears.What is the most likely explanation?

Question

Quizplus · Accepted Answer

The fact that the macromolecule disappeared after adding an enzyme that breaks phosphodiester bonds suggests that the macromolecule was DNA, which contains phosphodiester bonds. The fact that it was isolated from the cytosolic fraction of plant cells suggests that it may have come from the chloroplasts or mitochondria, which contain their own DNA.

A Biochemist Is Analyzing an Aqueous Solution of a Pure