PLEASE HELP ME When a neurotransmitter (ligand) binds to the ligand-gated ion channel of a postsynaptic neuron, the shape of the channel protein , allowing ions to flow the cell. These ions are messengers that perpetuate the signal transduction of the nerve signal.

Dna, in the nucleus carries the genetic code for making proteins in ribosomes. in the diagram, b, represents the proteins produced. dna cannot leave the nucleus to carry the genetic information to the ribosome where proteins are produced. how does the genetic code get from the nucleus to the ribosome? what does a represent? now