AP activates a  voltage gated Ca2+ channel in the T-tubule membrane, it triggers the opening of a Ca2+ -release channel in the closely associated SR membrane

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#Id: 9342

#Unit 4. Cell Communication and Cell Signaling

Prodomain prevents the latent TGF-β 

from binding to a cell-surface receptor.

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#Id: 6791

#Unit 3. Fundamental Processes

pri-miRNA is processed in a two-step reaction

The first step is catalyzed by Drosha, an RNase III superfamily member endonuclease, in the nucleus. Drosha reduces the pri-RNA to about a 70-bp, hairpin-shaped precursor fragment, pre-miRNA

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#Id: 7605

#Unit 5. Developmental Biology

The acrosome reaction, exposes the inner acrosomal membrane to the outside. The junction between this inner acrosomal membrane and the sperm cell membrane is called the equatorial region, and this is where membrane fusion between sperm and egg begins

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#Id: 4712

#Unit 13. Methods in Biology

The electronic transitions of the peptide bond occur in the far UV. The intense peak at 190 nm, and the weaker one at 210–220 nm is due to the p!p* and n!p* transitions.

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#Id: 4518

#Unit 13. Methods in Biology

Waves are divided in various groups:

Alpha

Beta 

Delta  

Theta

Gamma