In vivo, a plasma Ca 2+ level low enough to interfere with blood clotting is incompatible with life. In vitro, clotting can be prevented if Ca 2+ is removed from the blood by the addition of substances such as oxalates or chelating agents.

TLS Online TPP Program

#Id: 4931

#Unit 1. Molecules and their Interaction Relevant to Biology

Non-competitive inhibition 

TLS Online TPP Program

#Id: 8665

#Unit 10. Ecological Principles

Lack of environmental constraints hypothesis suggests preadaptation of some invaders to existing environmental conditions.

With few limitations to many abiotic environments, these invaders can grow quickly and outcompete native species

TLS Online TPP Program

#Id: 9378

#Unit 11. Evolution and Behavior

Learned behaviors - which are genetically hardwired and can be performed without any prior experience or training.

TLS Online TPP Program

#Id: 7019

#Unit 5. Developmental Biology

Once stem cells become positioned farther from the niche, signaling factors cannot reach them, and differentiation commences.

TLS Online TPP Program

#Id: 185

#Unit 5. Developmental Biology

A morphogen specifies cells in a quantitative (“more or less”) manner.