__________________is spontaneous hydrolytic reaction that involves cleavage of the N-glycosylic bond between N-9 of the purine bases A and G and C-1 of the deoxyribose sugar and hence loss of purine bases from the DNA.

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#Question id: 4610

#Zoology

It has been observed that organisms on islands are different from, but closely related to, similar forms found on the nearest continent. This is taken as evidence that ________.

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#Question id: 4612

#Zoology

The greatest number of endemic species is expected in environments that are ________.

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#Question id: 4616

#Zoology

Logically, which of these should cast the most doubt on the relationships depicted by an evolutionary tree?

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#Question id: 4617

#Zoology

Which of the following is not an observation or inference on which natural selection is based?

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#Question id: 4618

#Zoology

Which of the following observations helped Darwin shape his concept of descent with modification?

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#Question id: 4620

#Zoology

The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?