AIIMS 2019 Botany Cell Organelles MCQ Question
Which of the following doesn't have any membranous covering:
Mitochondria
Vacuole
Ribosome
Chloroplast
Correct Answer
Detailed Explanation
Ribosomes are non-membranous organelles composed of ribosomal RNA (rRNA) and proteins, functioning primarily in protein synthesis by translating messenger RNA (mRNA) into polypeptides. In contrast, mitochondria and chloroplasts are double-membrane-bound organelles involved in energy production and photosynthesis, respectively, while vacuoles are membrane-bound structures that store substances like nutrients and waste products. Thus, ribosomes stand out as the only option lacking any membranous covering.
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