Multiple choice

All the bacterial cells have the following constant structures except

  1. cell membranes & proteins

  2. cytoplasm & nucleoid

  3. nucleoid & ribosomes

  4. cell wall & thylakoid

  5. cell membranes & lipids
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cell wall is common to all bacterial cells except a few like mycoplasmas. Similarly, thylakoids are the specialized membranes of flattened discs that contain light sensitive pigments. These structures are commonly present in cyanobacteria - the photosynthetic bacteria, and they help in photosynthesis. Therefore, these structures are not common to all bacterial cells.

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