lac operon: synthesizes proteins for the metabolism of lactose (lac genes)
• when lactose and glucose are present, lac genes are not expressed
• when only lactose is present, lac genes are expressed
You are studying a bacterium that utilizes a sugar called athelose. This sugar can be used as an energy source when necessary. Metabolism of athelose is controlled by the ath operon. The genes of the ath operon code for the enzymes necessary to use athelose as an energy source. You have found the following:
• The genes of the ath operon are expressed only when the concentration of athelose in the bacterium is high.
• When glucose is absent, the bacterium needs to metabolize athelose as an energy source as much as possible.
• The same catabolite activator protein (CAP) involved with the lac operon interacts with the ath operon.
Based on this information, how is the ath operon most likely controlled? Drag the labels onto the diagram to identify the small molecules and the states of the regulatory proteins. Not all labels will be used.
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