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?

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#Question id: 573

#XL - Q Biochemistry

How is trypsinogen converted to trypsin?

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#Question id: 773

#XL - Q Biochemistry

Which of the following describes the function of an enzyme known as Dicer?

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#Question id: 10387

#XL - R Botany

Action spectrum stimulated phototropism in oat coleoptiles. The “three finger” pattern in the 400–500 nm region is characteristic of-

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#Question id: 11159

#XL - S Microbiology

Which kind of DNA should provide the best molecular clock for gauging the evolutionary relatedness of several species whose common ancestor became extinct billions of years ago?

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#Question id: 1623

#XL - S Microbiology

Which of the following is a complement component that is strongly chemotactic for neutrophils?