The O1 operator extends from position -5 just upstream of the mRNA start point to position +21 within the transcription unit.

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#Id: 1593

#Unit 5. Developmental Biology

Hensen’s node is the functional equivalent of the organizer (dorsal lip of the amphibian blastopore)

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#Id: 7191

#Unit 5. Developmental Biology

Nodal protein establishes left-right polarity, By activating Pitx2 on the left side

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#Id: 2486

#Unit 13. Methods in Biology

Photodecomposition of riboflavin generates a free radical that initiates polymerization.

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#Id: 4324

#Unit 11. Evolution and Behavior

His design allowed air inside the flasks to be exchanged with air from the outside, but prevented the introduction of any airborne microorganisms, which would get caught in the twists and bends of the flasks’ necks.

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#Id: 5770

#Unit 10. Ecological Principles

Evenness is a measure of how diverse a community is relative to the maximum possible diversity

E=Hs/Hmax