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: 1364

#Unit 4. Cell Communication and Cell Signaling

Phosphorylation of the activation loop leads to a conformational change in the JAK kinase that enhances the affinity of the enzyme for ATP & increasing kinase activity.

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#Id: 8573

#Unit 2. Cellular Organization

In all epithelia, keratin filaments associate with: Desmosomes (cell–cell contact)

Hemidesmosomes (cell–matrix contact)

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#Id: 1838

#Unit 11. Evolution and Behavior

Paleogene- Radiation of mammals, birds, snakes, angiosperms, pollinating insects

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#Id: 6786

#Unit 3. Fundamental Processes

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#Id: 4461

#Unit 13. Methods in Biology

Scanned-probe microscope scans the specimen without modifying it or exposing it to damaging high -energy radiation.