Every cell is covered by a membrane that controls what can enter and leave the cell. In all but quite primitive cells, a complex network of proteins provides organization and shape and, movement. The many body cells in an individual can be very different from one another, even though they are all descended from a single cell and thus have essentially identical genetic instructions. Different parts of the instructions are used in different types of cells, influenced by the cell's environment and past history. Explain how environmental factors affect development.
Function is related to structure.
Coordination of these functions is accomplished by specialized cells or groups of cells that monitor stimuli from the organism's internal and external environment enabling the organism to respond to changing environmental conditions. The genetic information passed from parents to offspring is coded in DNA molecules. The genetic information in DNA molecules provides instructions for assembling protein molecules. The code used is virtually the same for all life forms. Relate the structure of a particular protein such as hemoglobin to the function it performs, noting how errors in amino acid sequencing alters the function.