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Question

The eukaryotic 80S ribosomes are composed of 2 subunits of

A
40S and 40S
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B
50S and 30S
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C
60S and 40S
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D
50S and 50S
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Solution

The correct option is D 60S and 40S
The cytoplasmic ribosomes of eukaryotes are 80S. The have a size of 30-34 nm x 20-24 nm and weight of 4.0-4.5 million Daltons. The two subunits of 80S ribosomes are 60S and 40S. Ribosomes are molecular machines, which catalyze the translation of genetic information into proteins. They consist of two unequal subunits (small subunit and large subunit), both of which are large assemblies consisting of ribosomal RNA (rRNA) and ribosomal proteins.

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