A posterior-to-anterior gradient of Nanos protein.

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#Id: 2159

#Unit 9. Diversity of Life Forms

Animal Kingdom is characterized by multicellular, eukaryotic organisms. The cells lack cell walls.

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#Id: 4694

#Unit 11. Evolution and Behavior

An individual carrying the allele can pass copies of it to his or her own children. This is the allele’s direct fitness. The allele can also pass extra copies of itself to the next generation as the result of the increased fitness of relatives that benefit from the altruistic individual’s actions. This is the allele’s indirect fitness. 

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#Id: 6346

#Unit 8. Inheritance Biology

Z-Linked Characteristics

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#Id: 9451

#Unit 4. Cell Communication and Cell Signaling

The extracellular domain of cytokine receptors are constructed of two subdomains, each contains seven conserved β strands folded together

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#Id: 2285

#Unit 3. Fundamental Processes

Polymerase binding sites are called promoters