Input of energy in the form of ATP is required at several stages for the prepriming reaction, and it is required for unwinding DNA.

TLS Online TPP Program

#Id: 189

#Unit 5. Developmental Biology

Potency, commitment, specification, induction, competence, determination and differentiation; morphogenetic gradients; cell fate and cell lineages; stem cells; genomic equivalence and the cytoplasmic determinants; imprinting; mutants and transgenics in analysis of development

TLS Online TPP Program

#Id: 190

#Unit 5. Developmental Biology

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TLS Online TPP Program

#Id: 191

#Unit 5. Developmental Biology

At slightly lower concentrations (intermediate concentrations), activin (about 100 molecules per cell) activated the Xbra gene and instructed the cell to become muscle.

TLS Online TPP Program

#Id: 192

#Unit 5. Developmental Biology

At lower concentrations of activin, genes were not activated, and the “default” gene expression instructed the cells to become blood vessels and heart.

TLS Online TPP Program

#Id: 930

#Unit 5. Developmental Biology

Stem cells are sometimes referred to as “undifferentiated” due to this maintenance of proliferative properties.

TLS Online TPP Program

#Id: 931

#Unit 5. Developmental Biology

Stem cell potential refers to the range of cell types a stem cell can produce.