Prokaryotic organisms, such as bacteria and archaea, lack membrane-bound organelles like a nucleus, chloroplasts, and mitochondria. However, all prokaryotic cells possess ribosomes, which are responsible for protein synthesis. These ribosomes are smaller (70S type) compared to those found in eukaryotic cells (80S type). Why not the other options? A) Nucleus: Prokaryotes lack a true nucleus; their DNA is found in a nucleoid region, not enclosed by a membrane. C) Chloroplasts: Chloroplasts are membrane-bound organelles found in some eukaryotes (e.g., plants) for photosynthesis, not in prokaryotes. D) Mitochondria: Prokaryotes do not have mitochondria. Instead, they perform cellular respiration on the cell membrane. Thus, ribosomes are the universal cellular structure found in all prokaryotes.
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Sir 20th ques me ribosomes kyu hoga kyuki ribosome toh eukaryotic me bhi milta hai but it had asked only for all prokaryotic
Prokaryotic organisms, such as bacteria and archaea, lack membrane-bound organelles like a nucleus, chloroplasts, and mitochondria. However, all prokaryotic cells possess ribosomes, which are responsible for protein synthesis. These ribosomes are smaller (70S type) compared to those found in eukaryotic cells (80S type).
Why not the other options?
A) Nucleus: Prokaryotes lack a true nucleus; their DNA is found in a nucleoid region, not enclosed by a membrane.
C) Chloroplasts: Chloroplasts are membrane-bound organelles found in some eukaryotes (e.g., plants) for photosynthesis, not in prokaryotes.
D) Mitochondria: Prokaryotes do not have mitochondria. Instead, they perform cellular respiration on the cell membrane.
Thus, ribosomes are the universal cellular structure found in all prokaryotes.
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