What is the source of the nitrogen atoms 3 and 9 during the de novo biosynthesis of purines?

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#Question id: 26503

#Unit 3. Fundamental Processes

Match the following

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#Question id: 28792

#Unit 2. Cellular Organization

Which of the following cation concentration is involved in the regulation of Gelsolin?

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#Question id: 24537

#Unit 11. Evolution and Behavior

An allele at  one locus spreads by natural selection acting on a second locus that is in linkage disequilibrium is an example of____

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#Question id: 8707

#Unit 9. Diversity of Life Forms

Use the figure to answer the following question

The phylogenetic tree shown ________.

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#Question id: 2858

#Unit 2. Cellular Organization

When lactose enters the cell, it is converted to allolactose. It is allolactose (rather than lactose itself) that controls the Lac repressor. Paradoxically, the conversion of lactose to allolactose is catalyzed by b-galactosidase, itself encoded by one of the lac genes. How is this possible? Which statement is incorrect according lac genes expressions?