Biology / Bio 1283 · Atom · ~20 seconds
Ribosome Structure: Large and Small Subunits
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A ribosome is built from a large and a small subunit, each made of ribosomal RNA and protein, joining together only during translation.
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The small subunit binds mRNA first, and the large subunit joins afterward to form the complete, functional ribosome.
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A ribosome's two subunits exist separately in the cell most of the time — they assemble specifically to translate an mRNA.