Which of the following best explains how the structures of chitin and cellulose make them hard to digest

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.

Choose the molecule that is described by each phrase. energy used during long activities:

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?