To nucleate the assembly of branched actin filaments, Arp2/3 needs to be activated by a nucleation promoting factor (NPF)

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#Id: 7582

#Unit 5. Developmental Biology

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

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#Id: 7131

#Unit 6. System Physiology – Plant

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#Id: 4489

#Unit 13. Methods in Biology

PR segment – Conduction through AV node

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#Id: 3231

#Unit 4. Cell Communication and Cell Signaling

(+)-trans-anti-B-(a)-P-N superscript 2-d G adduct causes polymerase to insert an A rather than a C opposite the modified G base (Transversion mutation)

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#Id: 3720

#Unit 10. Ecological Principles

Clement’s organismic model - Competition causes sharp boundaries between groups of species; certain species group together.