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Why are two-component regulatory systems particularly useful for controlling geneexpression in response to environmental signals?1. A) Two proteins controlling a gene means there are two chances to activate agene.2. B) Two proteins delay the response time so the cell can be sure the change ispermanent.3. C) One of the two proteins can be exposed to the external environment toreceive a signal.4. D) Phosphorylation is a permanent change so genes are always turned on aftersignal
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