A Levels Biology (9700)•9700/12/O/N/18
Explanation
Prokaryotic features of Vibrio cholerae
Steps:
- Identify Vibrio cholerae as a bacterium, classifying it as prokaryotic.
- Recall prokaryotes contain circular DNA as their primary genetic material.
- Note prokaryotes lack membrane-bound organelles, excluding mitochondria.
- Determine ribosome type: prokaryotes use 70S, not 80S.
Why A is correct:
- Bacteria like Vibrio cholerae have a single circular chromosome, a defining prokaryotic trait per cell biology classification.
Why the others are wrong:
- B. 80S: Refers to eukaryotic ribosome subunit size; prokaryotes have 70S ribosomes.
- C. 80S ribosomes: Eukaryotic feature absent in prokaryotic cells like Vibrio cholerae.
- D. Mitochondria: Membrane-bound organelles exclusive to eukaryotes, not present in bacteria.
Final answer: A
Topic: Cells as the basic units of living organisms
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