two mutations of the lacI (repressor) gene have different effects. The IW mutation results in constant beta-galactosidase and permease production, even in the absence of lactose. The IS mutation prevents any production of these enzymes, even in the presence of lactose. Provide a possible explanation for the different effects of these two mutations on the repressor protein molecule

glycolysis is a process that fuel your metabolism. it is apart of cellular respiration the process that produce atp.

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desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".