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8 April, 15:07

Which statement best describes an operon? a. several genes, next to each other in eukaryotic DNA, that are transcribed as a single piece of mRNA b. a single gene in prokaryotic DNA that is transcribed as a single piece of mRNA c. several genes, next to each other in prokaryotic DNA, that are transcribed as a single piece of mRNA d. several genes, at different locations in prokaryotic DNA, which are transcribed as a single piece of mRNA

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  1. 8 April, 16:07
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    c. several genes, next to each other in prokaryotic DNA, that are transcribed as a single piece of mRNA

    Explanation:

    An operon is a functioning unit usually found in prokaryotes. It contains a group of genes under the control of same promoter such that when transcription occurs, these genes are transcribed together to form a single mRNA product. So the genes of an operon are either transcribed together or not transcribed at all. The mRNA formed is usually a polycistronic mRNA i. e. it codes for more than one protein.

    Operon has three parts: promoter, operator and structural genes. Promoter enables the structural genes to get transcribed. Operator in turn controls promoter. It's a segment of DNA to which the repressor molecule binds.
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Home » Biology » Which statement best describes an operon? a. several genes, next to each other in eukaryotic DNA, that are transcribed as a single piece of mRNA b. a single gene in prokaryotic DNA that is transcribed as a single piece of mRNA c.
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