Nucleation phase 

Two G-actin molecules bind relatively weakly to each other, but addition of a third actin monomer to form a trimer makes the entire group more stable, acts as a nucleus for polymerization.

TLS Online TPP Program

#Id: 912

#Unit 13. Methods in Biology

The MTT assay can measure cell proliferation or cell death.

TLS Online TPP Program

#Id: 8478

#Unit 1. Molecules and their Interaction Relevant to Biology

Parallel sheets are typically large structures; those composed of fewer than five strands are rare. 

Antiparallel sheets may consist of as few as two strands.

TLS Online TPP Program

#Id: 9666

#Unit 4. Cell Communication and Cell Signaling

PI-3 kinase adds a phosphate to the 3′ carbon in one of two separate PI substrates, leading to formation of two PI 3-phosphates: PI(3,4)P2 or PI(3,4,5)P3

TLS Online TPP Program

#Id: 7975

#Unit 10. Ecological Principles

In arid conditions, RWC values of less than 50% cause most plants to die

whereas values closer to 100% indicate plants are less affected by drought stress.

TLS Online TPP Program

#Id: 107

#Unit 5. Developmental Biology

A cell is determined to a given fate if it maintains its developmental maturation toward this cell type even when placed in a new environment (commitment is irreversible).