The membrane potential of the sperm cell becomes more negative as potassium ions leave the sperm. 

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#Id: 6598

#Unit 7. System Physiology – Animal

Female hormonal system, consists of three hierarchies of hormones:

GnRH

FSH and LH

Estrogen and progesterone

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#Id: 9773

#Unit 6. System Physiology – Plant

In Arabidopsis, PTI induces production of indole glucosinolates, to control of fungal pathogens. 

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#Id: 2383

#Unit 3. Fundamental Processes

Prp22 helps the release of the mature mRNA from the spliceosome, makes splicing irreversible.

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#Id: 8879

#Unit 2. Cellular Organization

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.

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#Id: 5847

#Unit 10. Ecological Principles

Ecosystem replacement - replaces the original community with a different one