Using microscope slides and dipping them into the boiling hot springs at yellowstone national park, scientists were able to collect these organisms. they are unicellular, prokaryotes with a cell wall. what are they?

The correct answer is-

Archaebacteria.

Archaebacteria is a domain of unicellular micro organisms, which constitute a group of most primitive forms of prokaryotes ( that is devoid of nucleus and membrane bound subcellular organelles). The organism under this domain are adapted to survive under extremely harsh conditions ( therefore also called extremophiles) such as boiling mud around volcano, hotsprings.

Example- Methanogens.

In the question, scientists were able to collect the organisms by using microscope slides, which were dipped into the boiling hot springs.

Thus, it represents the organisms collected were Archaebacteria.

this protocol provides a detailed procedure for chromatin immunoprecipitation (chip) to study the dna-protein interactions.

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.