Apoptotic cells attract phagocytes by releasing the lipid mediator lysophosphatidic acid, which functions as a chemoattractant.

TLS Online TPP Program

#Id: 4919

#Unit 1. Molecules and their Interaction Relevant to Biology

Secondary plots for competitive inhibition.

TLS Online TPP Program

#Id: 8389

#Unit 2. Cellular Organization

Smooth muscle contraction is regulated by the cycling of myosin II between on and off states.

TLS Online TPP Program

#Id: 9555

#Unit 11. Evolution and Behavior

Populational change is Darwin’s hypothesis that evolution occurs by changes in the proportions (frequencies) of different variant kinds of individuals within a population.

TLS Online TPP Program

#Id: 963

#Unit 5. Developmental Biology

The point of sperm entry -determines dorsal-ventral axis

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#Id: 5457

#Unit 7. System Physiology – Animal

The number of Na + channels per square micrometer of membrane in myelinated mammalian neurons has been estimated: 

50–75 in the cell body, 350–500 in initial segment, less than 25 on the surface of the myelin, 2000–12,000 at the nodes of Ranvier & 20–75 at the axon terminals