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Cytoskeleton

Electron micr...

Question

Electron microscopic study of cilium and flagellum revealed that they are covered with the plasma membrane and the core structure is called "axoneme", possesses a number of microtubules running parallel to the axis. How many numbers of microtubule arrays are arranged peripherally and centrally

A

9+2

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B

8+4

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C

9+3

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D

8+2

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Solution

The correct option is A 9+2
Cilia and flagella are covered with the plasma membrane and the core consists of microtubule-based cytoskeleton called the axoneme. The axoneme of cilia and flagella have 2 central microtubules and 9 peripheral doublets. The 9 microtubules are arranged as a cylindrical array of filaments. This arrangement is represented as 9+2 axoneme.
Thus, the correct answer is option A.

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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. 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.

The core of a cilium or flagellum composed of microtubules and their associated proteins is called ______________.

Q. Arrange the following in descending order basing on their numbers.
(A) Number of central microtubules in a cilium
(B) Number of radial spokes in a flagellum
(C) Number of nuclei found in a mature sieve tube cell
(D) Number of peripherals microtubules in a flagellum

The usual axonemal arrangement of microtubules is

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