Question

fill in the blank question
media that are used to determine the motility of bacteria and to localize a reaction at a specific site are called \boxed{} media.
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Explanation:

In microbiology (a subfield of Biology, which is part of Natural Science), semi - solid media have a consistency that allows bacteria to show motility (like spreading out from the inoculation site) and also helps in localizing reactions at specific sites. For example, in motility tests, bacteria can move through the semi - solid medium, and biochemical reactions can be observed at specific locations within it.

Answer:

semi - solid