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Cytoskeleton

The arrangeme...

Question

The arrangement of microtubules in cilia or flagella is called thearray.

A

9+1

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B

9+2

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C

9+0

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D

9+3

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Solution

The correct option is B 9+2
The core or the axoneme of the flagella or cilia has nine pairs of doublets and a pair of central microtubules. This arrangement is therefore called the 9+2 array.

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Q. The arrangement of microtubules regarding the structure of cilia/flagella is

Q. Assertion :The arrangement of axonemal microtubules in cilia or flagella is called

9 + 2

array. Reason: The axoneme usually has nine pairs or doublets of radially arranged peripheral microtubules, and a pair of centrally located microtubules.

Q. The pattern of microtubule arrangement of cilia and flagella is

Q. Read the following statements:
(i) Cilia and flagella work like oars
(ii) Cilia are relatively longer than flagella
(iii) Prokaryotic and eukaryotic flagella are structurally similar
(iv) Cilia and flagella are covered with plasma membrane in eukaryotes
(v) The core of cilia/flagella is called axoneme which has nine pairs of doublets or radially arranged peripheral microtubules and a pair of centrally located microtubules.
How many of the given statements are correct?

Q. Centrioles differ from cilia or flagella in
(a) the number of microtubules in each peripheral group
(b) the number of radial spokes
(c) the arrangement of microtubules
(d) containing proteinaceous central hub
(e) being surrounded by double membrane
Choose the correct set of options.

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