______ required to maintain ES cells in an undifferentiated state.

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#Question id: 13190

#Unit 10. Ecological Principles

During the evolution of life on Earth, the photosynthetic organisms initially responsible for raising atmospheric oxygen concentrations from less than 1 percent to about 20 percent were

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#Question id: 3624

#Unit 8. Inheritance Biology

To carry out a complementation test, parents that are homozygous for different mutations are crossed, producing offspring that mutant phenotype, it is due to

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#Question id: 10145

#Unit 6. System Physiology – Plant

The transfer of a phosphoryl group to 3-phosphoglycerate, yielding formation of 1,3-bisphosphoglycerate is catalyze by

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#Question id: 725

#Unit 1. Molecules and their Interaction Relevant to Biology

At 25°C values of [θ]222, the mean residue ellipticity at 222 nm, are - 33,000 and -3,000 deg cm2 dmol-1 for a polypeptide existing in α- helical (α) and β-structure (β), respectively. If this polypeptide undergoes a two-state heat-induced α-β transition, and a value of [θ]222 =  -15,000 deg cm2 dmol-1 is observed at 60°C, then this observation leads to the conclusion that the α helix conversion to β- structure is:

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#Question id: 17266

#Unit 11. Evolution and Behavior

First human social life in vertebrates and decline of woody plants appeared in ____