His ionisation series

1------pK1-----pKr--------pKr------14

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#Id: 9006

#Unit 6. System Physiology – Plant

The signals flow from the chloroplast to the nucleus is retrograde:

plastidial ferrochelatase I catalyzes the synthesis of heme, which in turn regulates the expression of nuclear encoded, chloroplast‐targeted proteins in greening leaves.

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#Id: 383

#Unit 2. Cellular Organization

First the H3.H4 assemble into tetramer (HOI) then DNA wrapped over H3.H4 tetramer. 

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#Id: 7065

#Unit 3. Fundamental Processes

The addition of the 3’-CCA is catalyzed by the enzyme tRNA nucleotidyltransferase, which functions as a nontemplate-directed RNA polymerase.

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#Id: 7791

#Unit 2. Cellular Organization

The mechanism for the import of cytoplasmic cargo proteins mediated by a nuclear transport receptor known as importin.

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#Id: 7595

#Unit 5. Developmental Biology

Chemotactic compounds hormone Progesterone,  made by the cumulus cells, might trigger the release of Protein kinase A from the sperm cell membrane, & allowing it to activate the sperm-specific cation CatSper channels would facilitate the transfer of calcium ions into the sperm, where they would cause exocytosis of the acrosome