Enzyme X exhibits maximum activity at pH = 6.9.  X shows a fairly sharp decrease in its activity when the pH goes much lower than 6.4.  One likely interpretation of this pH activity is that:

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#Question id: 11424

#XL - R Botany

In robert h. Whittaker's approach to relating terrestrial biomes and climatic variables, the principal biomes fall in a triangular area that does not include climates with __________.

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#Question id: 4192

#XL - T Zoology

At the end of the initiation step, the ribosome has a vacant

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#Question id: 563

#XL - Q Biochemistry

Both water and glucose share an —OH that can serve as a substrate for a reaction with the terminal phosphate of ATP catalyzed by hexokinase.  Glucose, however, is about a million times more reactive as a substrate than water.  The best explanation is that:

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#Question id: 17668

#XL - R Botany

The most recent common ancestor of all land plants was probably similar to modern-day members of which group? 

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#Question id: 13232

#XL - R Botany

Plants that develop root pressure frequently produce liquid droplets on the edges of their leaves, a phenomenon known as