How can one hormone, such as estrogen, mediate so many effects? A. Estrogen binds to common receptors inside several cell types, and each cell responds in the same way to its binding
B. Estrogen binds to specific receptors inside many kinds of cells, each of which has different responses to its binding
C. Estrogen is produced in high concentrations by a large number of different cell types
D. Estrogen does not affect cells that lack estrogen receptors in the cell membrane

Proteins are the workhorses of the cell, controlling virtually every reaction within as well as providing structure and serving as signals to other cells. proteins are long chains of  amino acids  , and the exact sequence of the amino acids determines the final structure and function of the protein. instructions for that sequence are encoded in  genes  . to make a particular protein, a messenger ribonucleic acid (mrna) copy is made from the gene (in the process called  transcription  ), and the mrna is transported to the  ribosome  . protein synthesis, also called  translation  , begins when the two ribosomal subunits link onto the mrna. this step, called initiation, is followed by elongation, in which successive amino acids are added to the growing chain, brought in by transfer rnas (trnas). in this step, the ribosome reads the  nucleotides  of mrna three by three, in units called  codons  , and matches each to three nucleotides on the trna, called the anticodon. finally, during termination, the ribosome unbinds from the mrna, and the  amino acid  chain goes on to be processed and folded to make the final, functional protein

Your answer is a because that is true