Dollo’s law:  A biological generalization positing that complex characters, once lost in evolution, are extremely unlikely to reappear and thus the loss of complex characters is virtually always irreversible.

TLS Online TPP Program

#Id: 9170

#XL - T Zoology

The overall change in allelic frequency

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#Id: 363

#XL - R Botany

When cellular iron concentrations return to normal levels, IRP1 is converted to aconitase, and IRP2 undergoes proteolytic degradation, ending the low-iron response.

TLS Online TPP Program

#Id: 7921

#XL - Q Biochemistry

Thermogenin activity is responsible for one of the principal functions of BAT: Thermogenesi

TLS Online TPP Program

#Id: 8879

#XL - R Botany

This combination of two positive feedback loops:

one that activates a CDK1 activator (Cdc25C)

one that inhibits a CDK1 inhibitor (Wee1)

results in the abrupt and irreversible transition from G2 into mitosis.

TLS Online TPP Program

#Id: 9781

#XL - R Botany

R gene products are also called as NBS–LRR