he structural genes in an operon are all co-transcribed as a single mR.docx

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he structural genes in an operon are all co-transcribed as a single mRNA when the operator is bound by the regulator. are transcribed individually as separate mRNAs when an operator is bound by the regulator. are transcribed individually when the regulator molecule is bound at the operator for each gene. are all cotranscribed as a single mRNA when the operator is not bound by the regulator. O are transcribed individually as separate mRNAs when an operator is not bound by the regulator. Solution The structural genes in an operon are all cotranscribed as a single mRNA when the operator is not bound by the regulator because when the operator binds tightly to the operator preventing transcription by RNA polymerase. However, when operator not bind DNA then It floats off the operator, clearing the way for RNA polymerase to cotranscribe the operon as a single mRNA .So Option 4 is correct. .

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A polycationic mRNA contains two or more promoter sequences. True False Solution Answer-False Description-operon is a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter.The genes are transcribed together into an mRNA strand and translated together in the cytoplasm, to create monocistronic mRNAs that are translated separately. several strands of mRNA that each encode a single gene productoperon contains one or more structural genes which are generally transcribed into one polycistronic mRNA-a single mRNA molecule that codes for more than one protein. the structural genes lies a promoter sequence which provides a site for RNA polymerase to bind and initiate transcription.Polycistronic mRNA is a mRNA that encodes several proteins and is characteristic of many bacterial and chloroplast mRNAs. Polycistronic mRNAs consist of a leader sequence which precedes the first gene. The gene is followed by an intercistronic region and then another gene. A trailer sequence follows the last gene in the mRNA. Examples of a polycistronic transcripts are found in the chloroplast.

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