The absorption of UV light by nucleic acids arises from n!p* and p!p* transitions of the purine (adenine, guanine) and pyrimidine (cytosine, thymine, uracil) bases that occur between 260 nm and 275 nm. 

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#Id: 5872

#Unit 10. Ecological Principles

The Greenhouse Effect Causes the Earth’s Temperature to Rise

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#Id: 10451

#Unit 4. Cell Communication and Cell Signaling

Chromosomal translocation 

That brings a growth regulatory gene under the control of alternative enhancers that cause inappropriate expression of the gene

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#Id: 1562

#Unit 4. Cell Communication and Cell Signaling

Lipidated Wnt can bind to Frizzled receptor because lipids are essential for Wnt to bind to Frizzled.

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#Id: 8834

#Unit 6. System Physiology – Plant

Buildup of a acidic thylakoid ΔpH in the presence of excess light resulting the thylakoid lumen activates an enzyme (violaxanthin de‐epoxidase) that converts violaxanthin into zeaxanthin

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#Id: 7023

#Unit 5. Developmental Biology

The daughter cell attached to the hub is maintained as a stem cell, whereas the cell that is not touching the hub becomes a gonialblast, a committed progenitor cell that will divide to become the precursors of the sperm cells.