The “default fate” of the ectoderm is to become neural tissue

TLS Online TPP Program

#Id: 5839

#Unit 10. Ecological Principles

Facilitation may be important in early seral stages and inhibition important in later ones or vice versa.

TLS Online TPP Program

#Id: 2573

#Unit 7. System Physiology – Animal

Paracellular Pathway

Water and solutes can be transported between the cells by moving across the tight junctions and intercellular spaces.

TLS Online TPP Program

#Id: 7157

#Unit 5. Developmental Biology

Gray Crescent 

The region opposite the point of sperm entry, where the greatest displacement of cytoplasm occurs (Gastrulation will begin)

Vegetal rotation: Vegetal cells asymmetrically press up against the inner blastocoel roof on the dorsal side.

Bottle cell formation and invagination: Localized apical constriction at the dorsal blastopore lip creates anisotropic forces that foster invagination.

Involution and cell migration: The leading edge of invaginating cells crawls up onto the blastocoel roof.

Convergence and extension: The targeted medial-to-lateral intercalation of cells on the midline (convergence) drives anterior-posterior axis elongation (extension).

TLS Online TPP Program

#Id: 8697

#Unit 1. Molecules and their Interaction Relevant to Biology

Transketolase catalyzes the transfer of a two carbon fragment from a ketose donor to an aldose acceptor with TPP

Transaldolase catalyses the transfer of a 3 carbon fragment

TLS Online TPP Program

#Id: 6260

#Unit 8. Inheritance Biology

Collaborative gene interaction