Antibodies protect potential host cells. They act against bacteria and viruses.
Simple molecules are further broken down in cells in a process called catabolism.
They contain molecules that help protect from getting to the brain.
Digestion is the breakdown of large food molecules into smaller molecules. The digested molecules are then absorbed into the bloodstream to be transported to the different parts of the body.
Cells convert the potential energy found in food molecules into ATP. This is done through the process of cellular respiration.
These are called macromolecules.
Enzymes
When molecules are actively leaving and entering cells, this process is called active transport. It is the only way of transportation that involves energy.
Tissues are connected to the cells organism by small molecules called cells.
A basic cell that has the potential to develop into many different kinds of cells is called a stem cell. Stem cells can be found in the umbilical cord blood right after birth.
Fermination
Vectors
They are called macromolecules, from the Greek word meaning "large" or "great".