Transcription of genes by rna polymerase requires energy, so a bacteria's operon is usually not always turned on. in e. coli bacteria, the trp operon encodes genes for the synthesis of tryptophan, and the lac operon encodes genes for the digestion of lactose. which strain of e. coli is likely to use its energy most efficiently?

Explain why biological control methods are generally environmentally superior to chemical pest control methods.

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?