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 Which of the following is absent in prokaryotes?

Option: 1

Cell wall

Option: 2


Option: 3



Option: 4


Answers (1)


Because prokaryotes don't have mitochondria, prokaryotes make their ATP on the cell surface membrane. Hence option 4 is the correct answer.


Explanation for the incorrect options :

Option 1 is incorrect because prokaryotic cell walls are composed of peptidoglycan, a polymer of modified sugars (N-acetylglucosamine and N-acetylmuramic acid) that has been crosslinked with short peptides.

Option 2 is incorrect because bacteria and other prokaryotic cells contain a free-floating, often circular chromosome that is not protected by a nuclear membrane. Instead, the DNA is only present in the nucleoid, a part of the cell.

Option 3 is incorrect because prokaryotes have a nucleoid in the center of the cell that houses the DNA but is not protected by a nuclear membrane. In addition to chromosomal DNA, many prokaryotes also possess smaller, circular DNA molecules known as plasmids, which can provide genetic benefits in particular situations.

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