When the potential reaches a threshold voltage of about −40 millivolts, the L-type calcium channels become “activated,” causing the action potential.

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#Id: 4237

#Unit 12. Applied Biology

Hayflick limit of animal cell culture

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#Id: 2940

#Unit 3. Fundamental Processes

Note that a crudal difference between replication in bacteria and replication in eukaryotes is that in bacteria replication is occurring on DNA, while in eukaryotes replication is occurring on chromatin and nucleosomes play a role so their presence must be taken into account.

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#Id: 6933

#Unit 8. Inheritance Biology

Inversions

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#Id: 5258

#Unit 7. System Physiology – Animal

Conducting cells are specialized muscle cells which function to rapidly spread action potentials over the entire myocardium.

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#Id: 3857

#Unit 5. Developmental Biology

Phosphorylation of RegA is mediated by sensor histidine kinases/phosphatases which either phosphorylate or dephosphorylate themselves on a histidine residue when a signal molecule binds to their sensor domain.