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Cell structure

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Question 6

A microbiologist isolates an unknown unicellular pathogen, Specimen Y\text{Y}Y, from a contaminated water supply. Analysis of the cell structure using high-resolution transmission electron microscopy (TEM) reveals several characteristics.

The student proposes three statements as valid evidence that Specimen Y\text{Y}Y is a prokaryote rather than a eukaryote:

  1. The main genomic DNA is circular and lies free in the cytoplasm without a surrounding nuclear membrane.
  2. The outer cell wall is composed of murein (peptidoglycan).
  3. The cell contains 70 S70\text{ S}70 S ribosomes.

Which of these statements provide(s) valid evidence to support the student's conclusion?

1, 2 and 3

Only 1

Only 1 and 2

Only 2 and 3

Cell structure Questions

  1. A Level
  2. /Biology
  3. /Cell structure