Why might owl pellets contain seeds and other plant material?

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.

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

How do cells grow and reproduce to maintain homeostasis?