They are characteristic for all organisms.
Cell differentiation starts in plants directly after the establishment of polarity.
In plants is gene activation especially controlled by endogenous and exogenous factors meaning that control genes and environmental factors influence the expression of numerous structural genes alike. Instead does it usually increase or decrease the transcriptional activities. A change towards a certain specialization does not mean that the whole former program is stopped and exchanged against a new one but that the ratio of produced enzymes, other structural proteins, and RNA towards each other is changed. Activity Changes of Enzymes Involved in Purine Recycling. Measurements were carried out on coleoptiles of lupin directly after germination.