The second level of organization is the coiling of the 10-nm fiber of nucleosomes into a helical array to constitute the fiber of diameter 30 nm.

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#Id: 1604

#Unit 5. Developmental Biology

Amniote cell specification (germ layer identity)is established before gastrulation starts, but the specification of cell type is controlled by inductive influences during and after migration through the primitive streak.

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#Id: 8618

#Unit 2. Cellular Organization

Cdc25 phosphatase Activates CDKs in fission yeast

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#Id: 7380

#Unit 5. Developmental Biology

Oskar mRNA becomes complexed to kinesin I, a “plus-directed” motor protein that moves it toward the growing end of the microtubules at the posterior region, where Oskar protein can bind nanos mRNA

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#Id: 10224

#Unit 6. System Physiology – Plant

BR biosynthetic pathway is a triterpenoid pathway. Mevalonic acid serves as a precursor of the triterpenoid pathway . Brassinosteroids are synthesized from the plant sterol campesterol

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#Id: 1180

#Unit 7. System Physiology – Animal

The photosensitive pigment in the rods is called rhodopsin (visual purple).