Question

quantifies bacteria and other microbes in environmental and tissue samples without isolating and culturing them
flow cytometer
coulter counter
pcr
no answer text provided.

Explanation:

A flow cytometer can quantify bacteria and other microbes in environmental and tissue samples without the need for isolation and culturing. It measures physical and chemical characteristics of particles in a fluid as it passes through a beam of light. A Coulter counter mainly counts cells based on electrical resistance changes and is not the best - fit for this description. PCR (Polymerase Chain Reaction) is mainly used for amplifying DNA rather than direct quantification of microbes without culturing in the described way.

Answer:

A. Flow cytometer