You need to discuss the different roles of different types of RNA:
mRNA allows the creation of a primary transcript of DNA which can be taken from the nucleus to the ribosome.
rRNA makes up the structure of the ribosome, where translation, the synthesis of a polypeptide chain, occurs.
tRNA transports amino acids to the ribosome and matches the RNA codon with its anticodon, and joins the amino acid to the polypeptide chain that is being created.
This is possible because of the length of the protein. It is always possible to add more amino acids and synthesize new protein and every new addition increases the number of possibilities drastically.
The very function, or job of CELL MEMBRANES is to protect the cell from it's surroundings, or in other words, to keep it safe. It controls the movement of substances in and out of cells and organelles, like a guard watching for suspicious activity and protecting something.
The cell membrane itself is a thin, flexible layer around the cells of all living things. It separates the inside of the cells from the outside of the cells.
