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: 11424

#Unit 10. Ecological Principles

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: 16771

#Unit 13. Methods in Biology

What is the median?

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#Question id: 361

#Unit 1. Molecules and their Interaction Relevant to Biology

Calculate the percentage of histidine that has its imidazole side chain protonated at pH 7.3. The pKa values for histidine are pK1 = 1.8, pK2 (imidazole) = 6.0, and pK3 = 9.2.

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#Question id: 23781

#Unit 7. System Physiology – Animal

Rhodopsin is comprised of 

a. An ketone of vitamin A

b. Opsin protein (GPCR)

c. An aldehyde of vitamin A

d. Retinal

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#Question id: 7030

#Unit 5. Developmental Biology

Organizer: