When the magnitude of the generator potential reaches about 10 mV, an action potential is produced at the first node of Ranvier.

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#Id: 2594

#Unit 13. Methods in Biology

A more attractive alternative is to cover the reaction mixture with a plug of inert wax and place the critical reagent on top of this plug. 

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#Id: 5639

#Unit 7. System Physiology – Animal

Blind spot  There are no visual receptors over the optic disk

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#Id: 9435

#Unit 11. Evolution and Behavior

Monogamy

Each individual mates exclusively with one partner over at least a single breeding cycle and sometimes for longer.

Monogamy occurs in fish, amphibians, reptiles, and mammals, but it is only commonly observed in birds, some rodents, and a few primate species.

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#Id: 8839

#Unit 10. Ecological Principles

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#Id: 8127

#Unit 1. Molecules and their Interaction Relevant to Biology

β-Carotene is the precursor of vitamin A1.
Oxidation at C-15 converts retinol to the aldehyde, retinal, and further oxidation produces retinoic acid, a hormone that regulates gene expression.