In the presence of Nodal, the Pitx2 gene is activated

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#Id: 10127

#Unit 6. System Physiology – Plant

Polar auxin transport is described in terms of the direction of its movement in relation to the base of the plant (the root–shoot junction). 

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#Id: 7133

#Unit 6. System Physiology – Plant

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#Id: 4320

#Unit 11. Evolution and Behavior

When the roof leaked and the grain molded, mice appeared. Jan Baptista van Helmont, a seventeenth century Flemish scientist, proposed that mice could arise from rags and wheat kernels left in an open container for 3 weeks. 

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#Id: 10309

#Unit 4. Cell Communication and Cell Signaling

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#Id: 6855

#Unit 3. Fundamental Processes