Protein structural motifs often have general functions in common.  Which one of the following motifs is known to be involved in protein dimer formation, but not in direct protein-DNA interactions?

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#Question id: 15713

#Unit 12. Applied Biology

A relatively ______ concentration of auxin favours cell proliferation and root differentiation while _______levels of cytokinin promote bud differentiation.

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#Question id: 5257

#Unit 8. Inheritance Biology

Which term is least closely associated with the others?

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#Question id: 11332

#Unit 10. Ecological Principles

The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that

 A) tropical communities are older.

 B) tropical regions generally have more available water and higher levels of solar radiation.

 C) higher temperatures cause more rapid speciation.

 D) diversity increases as evapotranspiration decreases.

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#Question id: 4925

#Unit 8. Inheritance Biology

The pedigree in Figure shows the transmission of a trait in a particular family. Based on this pattern of transmission, the trait is most likely

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#Question id: 13005

#Unit 8. Inheritance Biology

50 meiocytes with the genotype AaBb has 5% recombinational frequency in their gametes A and B, then how many meiocytes undergoes to the single crossing over ?