A prokaryote that differs from most other bacteria with respect to its very small size and obligates ...

A
The organisms addressed in Chapter 43 are obligate intracellular bacteria or are considered either extremely difficult to culture or unable to be cultured. Organisms of the genera Chlamydia, Chlamydophila, Rickettsia, Orientia, Anaplasma, and Ehrlichia are prokaryotes that differ from most other bacteria with respect to their very small size and obligate intracellular parasitism.

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D
Anaerobic PEA is similar to aerobic PEA in that it is selective for gram-positive bacteria but in-hibits enteric gram-negative rods and swarming by some Clostridia.

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A
Although a nonlactose fermenter, Acinetobacter spp. produces colonies that exhibit a purplish hue and may cause the organism to be mistaken for a lactose fermenter. The other organisms are nonlactose fermenters as well; however, they do not demonstrate this characteristic.

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B
The term complex is used in the clinical microbiology laboratory setting to describe two or more species whose distinction is complicated and of little or no medical importance. The mycobac-terial species that occur in humans and belong to the M. tuberculosis complex include M. tuber-culosis, Mycobacterium bovis, M. bovis bacillus Calmette-Gurin (BCG), Mycobacterium afri-canum, Mycobacterium caprae, Mycobacterium microti, Mycobacterium canettii, and Mycobac-terium pinnipedii. All of the species in the M. tuberculosis complex are capable of causing tu-berculosis.

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D
Both M. genitalium and M. hominis are negative for urease activity; therefore they are poor choices to test the validity of the agar. Either one of these organisms, along with U. urealyticum, should have been used; they are both negative and positive for urease activity, respectively.

This is very helpful, my teacher this year is not good