A) 50S + 30S
B) 40S + 30S
C) 50S + 20S
D) 40S + 60S
Correct Answer: A
Solution :
70S ribosomes consist of a large (50S) and a small (30S) subunits. Their large subunit is composed of a 5S RNA subunit (consisting of 120 nucleotides), a 23S RNA subunit (2900 nucleotides) and 34 proteins. The 30S subunit has a 1540 nucleotide RNA subunit (16S) bound to21 proteins.
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