Cuts heal when growth factors in the dermal layer of the skin signal cells in the epidermal layer to divide. This process takes time and coordination as shown in the figure below. In the past 10-20 years, researchers have conducted many in-vitro and animal studies that have showed promise using growth factors to facilitate healing in impaired wounds, bone regeneration, and nerve regeneration. Researchers hope that the application of growth factors may be used clinically to enhance the wound healing process. The cellular process that enables the cells to grow and develop into tissue is —

Ithink the answer is d.

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