Which of the following is NOT a characteristic of prokaryotic cells?

Question

BlackTom AI · Accepted Answer

To approach this question, I’ll evaluate each option in light of what prokaryotic cells typically possess.
Option 1: Cell wall. Many prokaryotes have a cell wall made of peptidoglycan (in bacteria) or other polymers in archaea, so this is indeed a characteristic of many prokaryotes, not the exception.
Option 2: Cell membrane. The cell membrane (plasma membrane) is a universal feature of prokaryotic cells, governing selective transport and barrier functions; thus this option is also a characteristic of prokaryotes, not the one that doesn’t belong.
Option 3: DNA. Prokaryotes contain DNA organized in a nucleoid region, not enclosed within a nucleus; this is another hallmark of prokaryotic cells, so it is not the correct choice for NOT being a characteristic.
Option 4: Endoplasmic reticulum. The endoplasmic reticulum is a membrane-bound organelle that is characteristic of eukaryotic cells and is not present in prokaryotes. Prokaryotes do not have membrane-bound organelles like the ER, and their cellular processes occur in the cytoplasm or along the cell membrane.
Option 5: Cytosol. Prokaryotic cells have cytosol where many metabolic reactions take place; this is a basic component of prokaryotic cell structure, so it is not the incorrect choice.
In summary, since prokaryotes lack membrane-bound organelles such as the endoplasmic reticulum, option 4 is the statement that is NOT a characteristic of prokaryotic cells, while the other options describe features they do have.

Which of the following is NOT a characteristic of prokaryotic cells?单项选择题

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