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5 Cards in this Set
- Front
- Back
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What are operons ?
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Operon is a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter
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How efficient are prokaryotes at regulating gene expression?
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They are very efficient at regulating gene expression. Their energy expenditure is more efficient.
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Describe the operon theory.
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suggests that a single promoter can simultaneously regulate the expression of several genes that are clustered together on a chromosome and involved in the same process.
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Describe an operon.
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A functioning unit of DNA containing a cluster of genes under the control of a single promoter and involved in one specific function. The operon has multiple translation start and stop sites.
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Describe a lac operon's role in lactose utilization?
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Lac operon is a single DNA unit responsible for the simultaneous regulation of the three structural genes, the LacZ, LacY, and LacA. The LacZ gene encodes for B-galactosidase,LacY gene encodes for lac permease, and LacA gene encodes for trans acetylase, along with its promoter and operator, the Lac operon is responsible for encoding proteins for lactose utilization as a fuel source. Normally the operons are not transcribed until needed, in which lactose is either present or glucose is absent.
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