Constitutively active Ras proteins (RasD) 

Replacement of the normal glycine 12 with any other amino acid (except proline) blocks the functional binding of GAP proteins and in essence “locks” Ras in the active GTP-bound state.

TLS Online TPP Program

#Id: 3775

#Unit 1. Molecules and their Interaction Relevant to Biology

The electrons revolve in orbits around the nucleus.

TLS Online TPP Program

#Id: 5505

#Unit 10. Ecological Principles

Metapopulations

Separate Populations That Mutually Affect One Another via Dispersal Fragmented landscapes create fragmented populations, many of which may exchange individuals via migration, creating one linked population

TLS Online TPP Program

#Id: 8115

#Unit 1. Molecules and their Interaction Relevant to Biology

Excreted S1P provokes many different cell and tissue effects, among them inflammation in allergic reactions, cell proliferation, angiogenesis, malignant transformation, and movement and migration of certain cells.

TLS Online TPP Program

#Id: 1015

#Unit 5. Developmental Biology

A fly have two X chromosomes and three sets of autosomes, it is a mosaic.

TLS Online TPP Program

#Id: 431

#Unit 2. Cellular Organization

Core DNA has an invariant length of 146 bp the minimum length of DNA needed to form a stable monomeric nucleosome, and is relatively resistant to digestion by nucleases.