Which of the following microbiological descriptions is correct for the bacterium Vibrio cholerae

Question

BlackTom AI · Accepted Answer

Here is the question and each answer option analyzed in detail, with attention to what is correct and what is incorrect.
Option a: 'Vibrio cholerae is a gram-positive, spiral-shaped bacterium. It is non-motile and can tolerate alkaline conditions.' This option is inaccurate on multiple counts. Vibrio cholerae is not gram-positive; it is gram-negative. It is not spirally shaped but curved rod-shaped. Additionally, it is known to be motile, not non-motile, due to its polar flagella. The combination of gram-positive, spiral shape, non-motility, and specific alkaline tolerance makes this statement incorrect.
Option b: 'Vibrio cholerae is a gram-negative, rod-shaped bacterium. It is non-motile and can tolerate alkaline conditions.' While the gram-negative and alkaline-tolerant parts are partly true, the organism is not non-motile; it is motile with a polar flagellum. Also, the typical description emphasizes a curved rod shape rather than a straight rod. So the claim of non-motility and the rod-like shape accuracy are both flawed.
Option c: 'Vibrio cholerae is a gram-positive bacterium with a slightly curved rod shape. It is highly motile and can tolerate acidic conditions.' This mixes several inaccuracies: it incorrectly states gram-positive, and while it mentions a curved rod, the standard descriptor is curved rod-shaped but not strictly ‘slightly curved’; more importantly, it claims gram-positive and acidic tolerance, whereas V. cholerae is gram-negative and not specifically characterized by tolerating acidic conditions as a defining feature. Overall, this option is incorrect due to the wrong Gram reaction and questionable tolerance claim.
Option d: 'Vibrio cholerae is a gram-negative bacterium with a slightly curved rod shape. It is highly motile and can tolerate alkaline conditions.' This option aligns with established microbiology descriptions: gram-negative, curved (slightly curved) rod-shaped, motile due to flagella, and able to tolerate alkaline (basic) conditions. All key features are represented accurately in this choice.
Option e: 'Vibrio cholerae is a gram-positive, coccus-shaped bacterium. It is highly motile and can tolerate alkaline conditions.' This is incorrect because V. cholerae is not gram-positive, not coccus-shaped (it is a curved rod), and while it is motile, the Gram reaction and shape components are fundamentally wrong here.
In summary, options a, b, c, and e each contain at least one major factual inaccuracy about Gram staining, shape, motility, or environmental tolerance. Only option d provides a coherent and correct microbiological description that matches Vibrio cholerae known characteristics.

Which of the following microbiological descriptions is correct for the bacterium Vibrio cholerae单项选择题

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