Which is absent in a prokaryotic cell?

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(C) Prokaryotic cells are characterized by the absence of membrane-bound organelles and a well-defined nucleus.$1$. $Mitochondria$ are membrane-bound

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Mitochondria

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(C) Prokaryotic cells are characterized by the absence of membrane-bound organelles and a well-defined nucleus.$1$. $Mitochondria$ are membrane-bound organelles responsible for cellular respiration,which are absent in prokaryotes.$2$. $Nucleolus$ is a dense region within the nucleus of eukaryotic cells where ribosomal $RNA$ is synthesized; since prokaryotes lack a true nucleus,they also lack a nucleolus.$3$. $Mesosomes$ are infoldings of the plasma membrane found in prokaryotes.$4$. $Ribosomes$ are present in both prokaryotic and eukaryotic cells (though of different sizes,$70S$ and $80S$ respectively).Since both $Mitochondria$ and $Nucleolus$ are absent in prokaryotes,in the context of standard multiple-choice questions,$Mitochondria$ is the most commonly cited membrane-bound organelle absent in prokaryotes. However,$Nucleolus$ is also absent. Given the options,$Mitochondria$ is the standard answer for membrane-bound organelles.

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