o Organisms grow larger by producing new cells.
o Even when an organism stops growing, new cells are constantly being produced to
replace ones that die or wear out.
o Cells reproduce by dividing – a process called cell division or mitosis.
o Before a cell divides, DNA must be copied so that each of the 2 daughter cells
produced has its own complete set of the instructions contained in the DNA. (In a
human, DNA replication occurs about 70 million times per day!)
o After DNA replication (copying), the DNA strands supercoil and form