Schwann cells are involved in myelin formation around axons in the peripheral nervous system.

TLS Online TPP Program

#Id: 9656

#Unit 4. Cell Communication and Cell Signaling

Feedback regulation by MAP Kinase

Active MAP kinase phosphorylates Raf on multiple sites, reducing its association with Ras.

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#Id: 5381

#Unit 10. Ecological Principles

Random: The rarest dispersion pattern is random because resources in nature are rarely randomly spaced.

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#Id: 7818

#Unit 10. Ecological Principles

In many endotherms, shivering occurs in cold conditions whereby the body undergoes rapid muscle contractions without any locomotion.

When the body temperature falls, brown fat cells increase their metabolic rate, and hence heat production.

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#Id: 10201

#Unit 6. System Physiology – Plant

Cytokinin Primary site of synthesis -- root tips.

High concentrations -- immature seeds and developing fruits

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#Id: 7446

#Unit 5. Developmental Biology

Adenylate cyclase A (ACA), is responsible for the synthesis of cAMP.