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Question

rRNA : protein ratio of 80 S ribosome is

A
40-44 : 56-60
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B
45-50 : 50-55
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C
50-55 : 50-55
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D
60-65 : 35-40
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Solution

The correct option is A 40-44 : 56-60
  • In a eukaryotic cell, the ribosome is 80S with a smaller subunit of 40S and a larger subunit of 60S type.
  • The 40S subunit has an 18S RNA with 1900 nucleotides and 33 proteins.
  • Whereas, the 60S subunit is made up of 5S RNA with 120 nucleotides, 28S RNA with 4700 nucleotides, 5.8S RNA with 160 nucleotides and 46 proteins.
  • The ratio of rRNA: protein ratio in 80S ribosomes is 40-44: 56-60.
  • So, the correct answer is '40-44: 56-60'.

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