Introns may more freely accumulate point substitutions and other changes due to no selection pressure.  Introns evolve or accumulate mutations/changes much more rapidly than exons

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#Id: 5775

#Unit 10. Ecological Principles

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#Id: 181

#Unit 5. Developmental Biology

Genetic specificity of induction:

mesenchyme may instruct the epithelium as to what sets of genes to activate, the responding epithelium can comply with these instructions only so far as its genome permits.

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#Id: 9700

#Unit 4. Cell Communication and Cell Signaling

Mating pathway in the yeast S. cerevisiae, is a MAP kinase cascade which linked to GPCRs.

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#Id: 442

#Unit 2. Cellular Organization

The nucleosome have 200 bp of DNA with octameric basic proteins into a beadlike structure.

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#Id: 8913

#Unit 2. Cellular Organization

APC/CCdc²⁰ is inhibited by a checkpoint pathway that ensures that anaphase is not initiated until all chromosomes have achieved proper attachment to the mitotic apparatus.