The following question is based on the observation that several dozen different proteins comprise the prokaryotic flagellum and its attachment to the prokaryotic cell, producing a highly complex structure.
If the complex protein assemblage of the prokaryotic flagellum arose by the same general processes as those of the complex eyes of molluscs (such as squids and octopi), then___________ (A) natural selection cannot account for the rise of the prokaryotic flagellum (B) ancestral versions of this protein assemblage were either less functional or had different functions than modern prokaryotic flagella (C) neither eyes nor flagella could have arisen by evolution because both are too complex to have evolved (D) the need for more complex structure must have driven evolution

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23-08-2022
Biology

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The following question is based on the observation that several dozen different proteins comprise the prokaryotic flagellum and its attachment to the prokaryotic cell, producing a highly complex structure.
If the complex protein assemblage of the prokaryotic flagellum arose by the same general processes as those of the complex eyes of molluscs (such as squids and octopi), then___________ (A) natural selection cannot account for the rise of the prokaryotic flagellum (B) ancestral versions of this protein assemblage were either less functional or had different functions than modern prokaryotic flagella (C) neither eyes nor flagella could have arisen by evolution because both are too complex to have evolved (D) the need for more complex structure must have driven evolution

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Tutorconsortium349 Tutorconsortium349 · Answer 1 · 2022-08-30T20:13:10+02:00

Correct option is B. If the complex protein assemblage of the prokaryotic flagellum arose by the same general processes as those of the complex eyes of molluscs (such as squids and octopi), then ancestral versions of this protein assemblage were either less functional or had different functions than modern prokaryotic flagella.

The flagella of prokaryotic and eukaryotic cells differ in the organization of the microtubules and the type of movement they have. In eukaryotes, the arrangement of microtubules is (9 + 2).

It has nine pairs of fused microtubule doublets surrounding two single central microtubules, forming the characteristic eukaryotic flagellum nucleus known as the axon.

Each of the 9 outer double microtubules extends a pair of dynein branches to the neighboring microtubule, generating force by hydrolysis of ATP, while the arrangement of microtubules seen in prokaryotes is (9 + 0).

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