A replication bubble forms a θ structure in circular DNA.

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#Id: 7565

#Unit 6. System Physiology – Plant

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#Id: 6836

#Unit 8. Inheritance Biology

Genetic–environmental interaction variance (VGE)

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#Id: 5511

#Unit 10. Ecological Principles

Populations of some species are prone to extinction for two reasons

1. The landscapes they live in are patchy (making dispersal between populations difficult).

2. Environmental conditions often change in a rapid and unpredictable manner.

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#Id: 9355

#Unit 4. Cell Communication and Cell Signaling

Most cells lack RIII, TGF-β binds directly to the RII

dimer, but Active RII kinase activity is not sufficient to generate an intracellular signal

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#Id: 7373

#Unit 5. Developmental Biology

At the same time, the protein products of the gap, pair-rule, and segment polarity genes interact to regulate another class of genes, the homeotic selector genes, whose transcription determines the developmental fate of each segment