AIIMS 2019 Botany Cell Organelles MCQ Question

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.