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The 45S rRNA transcript is first broken into ______________

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The 45S rRNA transcript is first broken into ______________

(a) 32S and 20S

(b) 19S and 36S

(c) 6S and 40S

(d) 32S, 20s and 7S

I have been asked this question in homework.

This intriguing question originated from RNA Processing Control topic in section Regulating Gene Expression in Eukaryotes of Cytogenetics

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Right answer is (a) 32S and 20S

Easiest explanation: The pre-rRNA transcript is first broken into 32S and 20S where each is processed to give 28S, 5.8S and 18S rRNA constituting the ribosome.

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