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How many types of distinct ribosomal RNAs are present in eukaryotic ribosomes?

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How many types of distinct ribosomal RNAs are present in eukaryotic ribosomes?

(a) 1

(b) 2

(c) 3

(d) 4

I got this question in an online interview.

The doubt is from Gene Expression topic in chapter Gene Expression of Cell Biology

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Correct choice is (d) 4

The best explanation: Eukaryotic ribosome or the 80S ribosome is made up of 2 unequal subunits(40S and 60S). The 40S subunit contains a 18S rRNA and the 60S subunit contains the 28S, 5S and the 5.8S rRNAs. Therefore the eukaryotic ribosomes have 4 rRNAs.

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