How were ribosomes observed first by George Palade

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Detailed Solution

Ribosomes were first observed by George Emil Palade in 1955 using an electron microscope while studying animal cells.

George Palade, a Romanian-American cell biologist, used an electron microscope to study the internal structure of cells. He discovered small, dense particles attached to the endoplasmic reticulum and scattered in the cytoplasm. These particles were later named ribosomes.

Discovery Details

Year of discovery: 1955
Instrument used: Electron microscope (which provides much higher magnification than a light microscope)
Observation: Small granules or dots attached to rough endoplasmic reticulum (RER)
Later confirmation: Biochemical studies showed these particles are made of RNA and proteins.

Significance of Discovery

Ribosomes were identified as the site of protein synthesis.
The discovery helped scientists understand how cells produce enzymes and other proteins.
Led to the concept of the “rough endoplasmic reticulum.”

Structure of Ribosomes