The gene for a hormone necessary for insect development binding sites for three

Question

The gene for a hormone necessary for insect development binding sites for three gene regulatory proteins called A, B, and (A and B cannot bind simultaneously because the binding sites for A and B overlap. You make mutations in the binding sites for each of the proteins and measure hormone production in cells that contain equal amounts of the A, B, and C proteins. The results of your studies are summarized in the figure and table below. For questions 16-18 complete the statement with the results shown in the table. A binds to its operator_____ tightly than B binds to its operator. More Less A is a ____activator of transcription than B Stronger Weaker C is able to prevent activation by____ A only B only Both A and B

Explanation / Answer

Protein A binds to its DNA-binding site [more tightly]than protein B binds to its DNA-binding site.B.

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Protein A is a [weaker] activator of transcription thanprotein B.

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Protein C is able to prevent activation by [both protein A and protein B ]

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hormone production “off” when all three sites are disrupted

as

Hormone production depends on the binding of either A or B.

At least one of theproteins must be bound.

When sites A and B are disrupted, neither can bind.Mustnot say that C must be bound because C is a repressor

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