Mitochondria use different origin sequences to initiate replication of each DNA strand

Replication of the H strand is initiated in a D loop.

Replication of the L strand is initiated when its origin is exposed by the movement of the first replication fork.

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#Unit 3. Fundamental Processes

Extensive shortening of telomeres is recognized by the cell as a double-strand break and consequently triggers cell cycle arrest and apoptosis.

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#Unit 7. System Physiology – Animal

In resting cells, virtually all of the GLUT4 is localized to small vesicles in the cytosol While some GLUT4 is in endosomes, most is in a unique small organelle termed the GLUT4 storage vesicle (GSV)

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#Unit 6. System Physiology – Plant

The auxin receptor is composed of two proteins: the SCF complex component TIR1 and the repressor protein AUX/IAA.

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#Unit 6. System Physiology – Plant

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#Unit 7. System Physiology – Animal

ACTH (corticotropin) 

controls the secretion of cortisol by the activation of adenylyl cyclase via Galpha s.