Which type of bacteria is associated with enzyme decomposition?

Saprophytic bacteria are known for their role in decomposing organic matter. These bacteria thrive on dead and decaying plant and animal materials, breaking them down through enzymatic processes. This decomposition is essential for nutrient cycling in ecosystems, as it helps release nutrients back into the soil, making them available for other organisms.

Pathogenic bacteria, on the other hand, are associated with disease and infection in living hosts rather than decomposition. Symbiotic bacteria typically engage in mutually beneficial relationships with other organisms instead of focusing on decomposition. Retroviruses, which are a type of virus, do not pertain to bacterial processes at all, as they focus on infecting host cells and using the host's machinery for replication rather than engaging in the decomposition of organic material.

Thus, the correct association of enzyme decomposition is with saprophytic bacteria, given their primary function in breaking down complex organic substances through enzymatic action.