From that point, downward movement is described as acropetal (toward the apex). Movement of auxin from the apex of the root toward the root–shoot junction is also described as basipetal (toward the base).

TLS Online TPP Program

#Id: 712

#Unit 3. Fundamental Processes

Hda is recruited by DNA Polymerase in previous cycle and it acts to switch off DnaA, preventing a second round of replication.

TLS Online TPP Program

#Id: 6384

#Unit 2. Cellular Organization

The DNA-binding domain occupies residues 1–59. It contains two a-helices separated by a turn. This is a common DNA-binding motif known as the HTH (helix-turn-helix); the two a-helices fit into the major groove of DNA

TLS Online TPP Program

#Id: 4697

#Unit 11. Evolution and Behavior

Degree of genetic relatedness

TLS Online TPP Program

#Id: 7224

#Unit 5. Developmental Biology

Two distinct selection processes are required

Positive selection, which selects for those thymocytes bearing receptors capable of binding self-MHC molecules, resulting in MHC restriction

Negative selection, which selects against thymocytes bearing high-affinity receptors for self-MHC/peptide complexes, resulting in self-tolerance.

TLS Online TPP Program

#Id: 3038

#Unit 3. Fundamental Processes

Core polymerase and the clamp dissociate at completion of Okazaki fragment synthesis and reassociate at the beginning.