The entry of Na+ causes the opening of more voltage- gated Na+ channels and further depolarization, setting up a positive feedback loop .

TLS Online TPP Program

#Id: 7518

#Unit 6. System Physiology – Plant

Auxin influx 

Auxin can enter plant cells from any direction by either of two mechanisms:

Passive diffusion of the protonated (IAAH) form across the phospholipid bilayer

Secondary active transport of the dissociated (IAA–) form via a 2H+–IAA– symporter

The dual pathway of auxin uptake arises because the passive permeability of the membrane to auxin depends strongly on the apoplastic pH.

TLS Online TPP Program

#Id: 1051

#Unit 5. Developmental Biology

Homeobox transcription factors, or Hox genes, play an essential role in specifying whether a particular mesenchymal cell will become stylopod, zeugopod, or autopod.

TLS Online TPP Program

#Id: 6742

#Unit 8. Inheritance Biology

TLS Online TPP Program

#Id: 5737

#Unit 10. Ecological Principles

Five Hypotheses Explain How Species Richness Affects Community Services Diversity-stability hypothesis, more species are present, the more stable the community.

TLS Online TPP Program

#Id: 4912

#Unit 13. Methods in Biology

Standard Deviation - The spread of statistical data is measured by the standard deviation.