Expression of the GAL, lac and trp structural genes all involve coordinated regulation in response to cellular metabolic needs. Answer the following T/F regarding how this coordinated regulation is achieved.

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30-11-2022
Biology

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Expression of the GAL, lac and trp structural genes all involve coordinated regulation in response to cellular metabolic needs. Answer the following T/F regarding how this coordinated regulation is achieved.

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GAL regulatory genes are translated from a polycistronic mRNA. This statement is false. GAL regulatory genes are not translated by polycistronic mRNA. They are inactivated in the absence of galactose. In the presence of galactose, they are transcribed. So the statement is false.

All GAL structural genes have UAS elements in their enhancer regions. This statement is true. UAS is the upstream activating sequence. It is a cis-acting sequence. It plays a role in activating transcription. So the statement is true. Trp structural genes are transcribed as a polycistronic mRNA. This statement is true. Tryptophan operon contains one or more structural genes which are transcribed into one polycistronic mRNA. This operon responds to a repressor protein. Lac structural genes share a similar chromatin state. This statement is false. Lac structural genes do not have similar chromatin structures.

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