Which pure substance can be classified as an element

How is an environment able to support different varieties of organisms?

Wht happens as electrons in the electron transport chain release their energy

The trp operon in e. coli regulates genes that code for enzymes required for synthesis of the repressible operon. when tryptophan is not available amino acid tryptophan. the trp operon is a in the environment, the trp repressor protein activeinactiveregulated. therefore, rna polymerase can bind to the genes to begin transcription.