BIOLOGY 151 Lecture Notes - Lecture 3: Phosphorylation, Chemical Bond, Tyrosine
Document Summary
Section 20. 1 genetic programs of development- stem cell intro. Upon fertilization, the egg becomes a zygote and cell division starts. All the cells of the organism will be formed from cells derived from that single fertilized egg. Stem cell crypts in hair follicles and digestive system. Stem cells being used in many different ways. Important difference and similarities between stem cells and differentiated cells. Both stem cells and differentiated cells have all the genes. They differ in the regulation of those genes and express very different gene sets. Stem cells and differentiated cells can send and receive signals but their ability to do so changes as cells mature. Stem cells can divide and differentiate, maturing cells can still divide as they differentiate. Broad issues that relate to stem cell biology. Cell behavior changes in response to external signals. Signals are transmitted from outside the cell to inside the cell through a process called signal transduction.
