Observe the micrograph and draw conclusions about the indicated bacterium. Based
ID: 178665 • Letter: O
Question
Observe the micrograph and draw conclusions about the indicated bacterium.
Based on your observation of the indicated bacterial structure in this micrograph, select ALL appropriate statements.
A. The indicated structure can be used for adhesion. B. The indicated bacterium is resistant to drying (desiccation). C. The indicated structure is a slime layer. D. The indicated structure could serve as a virulence factor. E. The indicated structure is a capsule. F. The indicated structure is just a microscopy artifact. 0.2Explanation / Answer
A, B, D, E are true.
The indicated structure is a capsule. It is a thick and rigid protective layer found in both gram positive as well as gram negative bacteria. It helps bacteria to adhere to surfaces (Bacterial adhesion is crucial to pathogenesis and biofilm formation). It also contains water, therefore protects the organism against desiccation. It is also a virulence factor, as it protects the cell against host defence, as well as antibiotics and disinfectants. The capsule also elicits immunological reactions.
The structure is not a slime layer, because a slime layer is a diffused and less distinguishable. It is able to be easily washed of. They are not microscopic artefacts either.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.