Yes - that response is correct.

Plaque is a soft deposit that forms on teeth and is made up of colonies of microorganisms. It is a dense, non-mineralized, complex mass of colonies in a gel-like intermicrobial matrix that adheres firmly to the teeth. Bacteria, as well as mycoplasmas, yeasts, protozoa and viruses can be found in plaque.

The cariogenic microorganisms in the plaque (primarily mutans streptococci - MS) break down the sucrose to an acid immediately, and alter the pH of the plaque to a level where it will cause demineralization of tooth structure.