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| Description: a) Electron micrograph of polyribosomes shows that as mRNAs are being transcribed from DNA, multiple ribosomes are bound to each mRNA, to translate it and to produce polypeptides. (b) Artist rendition of the polyribosome electron micrograph. Transcription moves left to right, so the mRNA length increases toward the right. Translation is shown on one mRNA. It begins at the bottom (the 5ˊ mRNA end) and progresses in the 3 direction toward the top
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