Molecular clock - The concept of a steady rate of change in DNA sequences over time. 

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#Id: 2864

#Unit 13. Methods in Biology

A number of amino acids (Asp, Glu, Asn, Gln, Arg and His) have weak electronic transitions at around 210 nm Usually, these cannot be observed in proteins because they are masked by the more intense peptide bond absorption.

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#Id: 9968

#Unit 4. Cell Communication and Cell Signaling

“canonical” Wnt signaling uses a second TM protein, LRP that associates with Frizzled in a Wnt signal– dependent manner.

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#Id: 637

#Unit 3. Fundamental Processes

Guanine is deaminated to xanthine.

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#Id: 948

#Unit 5. Developmental Biology

Active guanylyl cyclase causes the sperm cell to produce more cGMP, that activates a calcium channel in the cell membrane of the sperm tail.

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#Id: 3732

#Unit 10. Ecological Principles