DnaA then acts at three A-T–rich 13-bp tandem repeats located on the left side of oriC.

TLS Online TPP Program

#Id: 1775

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 2264

#Unit 11. Evolution and Behavior

The selection gradient measures the strength of directional selection acting on a quantitative trait

TLS Online TPP Program

#Id: 9619

#Unit 4. Cell Communication and Cell Signaling

HER2 (mouse Erb-B2), cannot bind any ligand, it can form a heterodimer with ligand-activated HER1, HER3, or HER4 (Erb-B1, 3, or 4)

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#Id: 7424

#Unit 5. Developmental Biology

Dictyostelium can utilize one of three survival strategies when food starvation-

 Microcyst formation, favoured in dark & wet conditions, or ammonia levels are high.

 Zygote formation, favoured in dark & wet conditions, & is triggered by ethylene produced by the cells. 

Cell aggregation & differentiation

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#Id: 8464

#Unit 1. Molecules and their Interaction Relevant to Biology

The overall effect is a significant net dipole for the a helix that gives a partial positive charge at the amino end and a partial negative charge at the carboxy end of the a helix.