BotanyWhich of the following statements is/are correct?a. Flagella have 9 + 2 arrangement of microtubulesb. Centrioles have 9 + 0 arrangement of microtubulesc. Structure of kinetosome and centriole is the same.

Which of the following statements is/are correct?

a. Flagella have 9 + 2 arrangement of microtubules
b. Centrioles have 9 + 0 arrangement of microtubules
c. Structure of kinetosome and centriole is the same.

  1. A

    Only a and b

  2. B

    All a, b and c

  3. C

    Only b and c

  4. D

    Only b

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    Solution:

    The flagella have a 9 + 2 arrangement. The centriole of the flagella constitute the 9 + 2 arrangement of the microtubules. The flagella have 9 triplets of the microtubules, arranged in the peripheral region, with 2 microtubules at the centre.

    Some centrioles have 9 + 0 arrangement with 9 triplet microtubules at the peripheral region only. This type of arrangement is seen in paramecium.

    Kinetosomes are similar structures to the centrioles. The cartwheel arrangement is seen in both structures. These kinetosomes are seen in some organisms, such as paramecium.

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