The Death of a Gene

When a gene is duplicated, the new copy is often dead-on arrival (lacks the regulatory elements). 

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#Id: 3429

#Unit 6. System Physiology – Plant

In molecules, two types of excited states can exist;
a) The singlet state is relatively short‐lived and contains electrons with opposite (antiparallel) spins.
b) The more long‐lived triplet state has electron spins that are aligned (parallel).

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#Id: 3820

#Unit 5. Developmental Biology

The top of the mound continues to emit cAMP pulses and is pushed upwards by the movement of cells underneath

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#Id: 10304

#Unit 4. Cell Communication and Cell Signaling

Negative costimulation

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#Id: 9896

#Unit 4. Cell Communication and Cell Signaling

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#Id: 6012

#Unit 3. Fundamental Processes

Cdc6 has an ATPase activity that is required for it to support initiation.