Calculate the heat of formation of benzene from the following data, assuming no resonance. Bond energies :

C – C = 83 kcal = 140 kcal C – H = 99 kcal

Heat of atomisation of C = 170 .9 kcal

Heat of atomisation of H = 52.1 kcal

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#Question id: 10324

#XL - R Botany

Which of the following is not true of all horizontally oriented phylogenetic trees, where time advances to the right?

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#Question id: 10325

#XL - S Microbiology

Ultimately, which of these serves as the basis for both the principle of maximum parsimony and the principle that shared complexity indicates homology rather than analogy?

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#Question id: 10326

#XL - S Microbiology

Shared derived characters are most likely to be found in taxa that are

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#Question id: 10327

#XL - S Microbiology

A taxon, all of whose members have the same common ancestor, is

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#Question id: 10328

#XL - S Microbiology

The term that is most appropriately associated with clade is

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#Question id: 10329

#XL - S Microbiology

If birds are excluded from the class Reptilia, the term that consequently describes the class Reptilia is