Introduction to Prokaryotes, Eukaryotes:

Microorganisms and all other living organisms are classified as prokaryotes or eukaryotes. Prokaryotes and eukaryotes are distinguished on the basis of their cellular characteristics. For example, prokaryotic cells lack a nucleus and other memorane‐bound structures known as organelles, while eukaryotic cells have both a nucleus and organelles.

Prokaryotic and eukaryotic cells are similar in several ways. Both types of cells are enclosed by cell membranes (plasma membranes), and both use DNA for their genetic information.
Prokaryotes include several kinds of microorganisms, such as bacteria and cyanobacteria. Eukaryotes include such microorganisms as fungi, protozoa, and simple algae. Viruses are considered neither prokaryotes nor eukaryotes because they lack the characteristics of living things, except the ability to replicate (which they accomplish only in living cells).

Biochemical Tests (IMViC):

The IMViC tests are a group of individual tests used in microbiology lab testing to identify an organism in the coliform group. A coliform is a gram negative, aerobic, or facultative anaerobic rod, which produces gas from lactose within 48 hours. The presence of some coliforms indicate fecal contamination.

The term "IMViC" is an acronym for each of these tests.
"I" is for indole test;
"M" is for methyl red test;
"V" is for Voges-Proskauer test;
"C" is for citrate test;
The lower case "i" is merely for "in" as the Citrate test requires coliform samples to be placed "in Citrate".
-Triple sugar iron test (TSI), Urease test and Malonate test are also included in this test.
-These tests are useful in distinguishing members of Enterobacteriaceae.