Exon Sequences Under Positive Selection Vary but Introns Are Conserved

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#Id: 1231

#Unit 7. System Physiology – Animal

1α-hydroxylase, converts 25-hydroxycholecalciferol to the active form, 1,25-dihydroxycholecalciferol.

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#Id: 3869

#Unit 5. Developmental Biology

Newly activated genes are:

Adenylate cyclase A (ACA)
PKA
cAMP receptors (cARs)
Extracellular cAMP phosphodiesterase PdsA
An intracellular cAMP phosphodiesterase RegA

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#Id: 7762

#Unit 1. Molecules and their Interaction Relevant to Biology

In a covalent bond, electrons are shared between atoms. In an ionic bond, electrons are transferred between atoms.

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#Id: 8595

#Unit 2. Cellular Organization

Mutations in lamin A 

cause progeria accelerated aging, such as Hutchison-Gilford progeria (“prematurely old”)

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#Id: 9557

#Unit 11. Evolution and Behavior

Where, though, do these hereditary variations come from?

This was the great gap in Darwin’s theory, and he never filled it. The problem was serious because, according to the prevailing belief in blending inheritance, variation should decrease, not increase.