Ribosomes are tiny, non-membrane-bound organelles responsible for protein synthesis. They can be free in the cytoplasm or attached to the rough endoplasmic reticulum (RER).

• Composed of two subunits (large and small).
• Made of two-thirds rRNA and one-third protein.
• In prokaryotes: 70S ribosomes.
• In eukaryotes: 80S ribosomes.
• Site of protein synthesis essential for cell survival.

Lyric Line	Explanation
Ribosomes, tiny but strong	Ribosomes are small but vital for protein synthesis.
Non-membrane organelles all along	Ribosomes lack membranes.
In the cytoplasm or on ER they stay	Free or attached to RER.
Two-thirds RNA, one-third protein	Composition of ribosomes.
70S in prokaryotes, 80S in eukaryotes	Different sedimentation coefficients.
Two subunits come as one	Large and small subunits join during translation.
rRNA and proteins combined	Structural and functional makeup.
Protein synthesis, cell survives	They build proteins needed for survival.

"Ribo = Ribs = Proteins" → Ribosomes = Protein factories

1. Ribosomes are made of?

rRNA + ProteinsDNA + Lipids

2. Membrane present?

NoYes

3. In prokaryotes ribosomes are?

70S80S

4. In eukaryotes ribosomes are?

80S70S

5. Ribosome function?

Protein synthesisDNA storage

6. Location of ribosomes?

Cytoplasm & RERNucleus only

7. Ribosomes have?

Two subunitsOne unit

8. Ribosomes are seen with?

Electron microscopeNaked eye

9. Main component?

rRNADNA

10. Ribosomes are essential for?

Cell survivalRespiration only

Drag items into correct categories:

• Ribosomes = Protein factories.
• Non-membrane organelles in cytoplasm & RER.
• 70S in prokaryotes, 80S in eukaryotes.
• Made of rRNA and proteins.
• Essential for protein synthesis and cell survival.