During the specification of neural crest cells, the neural plate is bordered by neural crest anteriorly and caudally, and by placodal ectoderm anteriorly. If the ectodermal cells receive both BMP and Wnt for an extended period of time, they become

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#Question id: 4569

#Unit 11. Evolution and Behavior

Which of the following must exist in a population before natural selection can act upon that population?

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#Question id: 9051

#Unit 9. Diversity of Life Forms

What would happen to the seasons if Earth were tilted 35 degrees off its orbital plane instead of the usual 23.5 degrees?

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#Question id: 20003

#Unit 12. Applied Biology

In plants proline is preferentially produced from ornithine under normal conditions. However, under stress it is made directly from 

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#Question id: 30117

#Unit 1. Molecules and their Interaction Relevant to Biology

Catabolic end product of purines is

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#Question id: 8291

#Unit 9. Diversity of Life Forms

Which of the following pairs are the best examples of homologous structures?