BIOLOGY 151 Lecture Notes - Lecture 3: Unipotent, Cellular Differentiation, Cell Potency
Document Summary
Both cells end up with the same sequence of nucleotides. The purpose of the cell changes but dna always stays the same. A certain part of the genome is selected for expression. The cell knows what it is going to turn into but has not changed yet. The process by which an unspecialized stem cell turns into a specialized cell such as a heart, liver, or muscle cell. Can be triggered by internal or external signals. The cell gains new differences and changes its biochemistry, structure, and function. Cells cannot de-differentiate because morphological and physiological changes have occurred that cannot be reversed. One cell is a stem cell and the other is now a differentiated cell. Can form any of the cell types in a body. Can form all of the cell types that make up the body. Can develop into more than one cell type, but not all cell types. Can only form one kind of cell.
