What is the difference between a cell wall and a cell membrane

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

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

During the process of blank and molecules such as a glucose must use a protein channel to cross through a cell membrane