alleryStart learning →Mature rRNAs make up roughly what fraction of a ribosome?
AAbout 50 percent
BAbout 10 percent
CAbout 90 percent
DAbout 25 percent
Answer & Solution
Correct answer: A. About 50 percent
1. A ribosome is built from rRNA molecules and many distinct polypeptides.
2. The mature rRNAs make up approximately 50 percent of each ribosome.
3. Some of those rRNA molecules are purely structural while others have catalytic or binding activity.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 15 "Genes and Proteins", section 15.4 RNA Processing in Eukaryotes_
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