A stem cell retains the ability to divide and re-create itself while also having the ability to generate progeny capable of specializing into a more differentiated cell type. 

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#Id: 7588

#Unit 5. Developmental Biology

Toward the end of capacitation, sperm become hyperactivated—The symmetrical beating of the flagellum is changed into a rapid asynchronous beat with a higher degree of bending. 

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#Id: 10117

#Unit 6. System Physiology – Plant

Auxins in biological samples can be determined by bioassay, mass spectrometry, or enzyme-linked immunosorbent assay (ELISA).

The Avena coleoptile curvature assay is a sensitive measure of auxin activity (it is effective for IAA concentrations of about 0.02 to 0.2 mg L–1).

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#Id: 5658

#Unit 7. System Physiology – Animal

The membranous labyrinth more or less duplicates the shape of the bony channels and is filled with a K+-rich fluid called endolymph

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#Id: 8665

#Unit 10. Ecological Principles

Lack of environmental constraints hypothesis suggests preadaptation of some invaders to existing environmental conditions.

With few limitations to many abiotic environments, these invaders can grow quickly and outcompete native species

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#Id: 7881

#Unit 2. Cellular Organization

MICOS mediates close juxtaposition of the outer membrane and inner membrane by binding to outer membrane–associated proteins