What is true about ribosomes?
Correct answer: B. These are composed of ribonucleic acid and proteins
- A. The prokaryotic ribosomes are 80S, where "S" stands for sedimentation coefficient
- B. These are composed of ribonucleic acid and proteins
- C. These are found only in eukaryotic cells
- D. These are self-splicing introns of some RNAs
Explanation
Ribosomes are cellular organelles that play a crucial role in protein synthesis. They are composed of ribosomal RNA (rRNA) and proteins, forming two subunits: a small subunit and a large subunit. These subunits come together during protein translation to facilitate the assembly of amino acids into polypeptides, based on the sequence of codons in mRNA. Ribosomes are found in both prokaryotic and eukaryotic cells, although their size differs (70S in prokaryotes and 80S in eukaryotes).
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About Cell Structure and Function
Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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