Which is true? a. in long bones, the epiphyseal line is sharper as we age. b. in long bones, the epiphyseal line disappears as we age. c. in long bones, the head and shaft fuse as we get older. d. b & c

In longer bones epiphyseal line sharpens as we age . The epiphyseal plate a part of bone ossifies or hardens and becomes the part of the bone. As the plate ossifies an epiphyseal lina is formed . Presence of epiphyseal line on the long bones helps to calculate the age of the skeleton.

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