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The correct centripetal sequence of diff...

The correct centripetal sequence of different parts of cilium or flagellum
A. Central sheath B. Central microtubule C. Radial spoke D. Plasmamembrane E. Peripheral microtubules

A

D,E,C,B,A

B

D,E,A,C,B

C

D,B,C,A,E

D

D,E,C,A,B

Text Solution

AI Generated Solution

The correct Answer is:
To determine the correct centripetal sequence of different parts of a cilium or flagellum, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Structure**: Understand that cilia and flagella have a specific arrangement of microtubules and associated structures. They are typically organized in a "9+2" arrangement, which means there are 9 pairs of peripheral microtubules surrounding 2 central microtubules. 2. **List the Components**: The components provided in the question are: - A. Central sheath - B. Central microtubule - C. Radial spoke - D. Plasma membrane - E. Peripheral microtubules 3. **Determine the Outermost Layer**: The plasma membrane (D) is the outermost layer of the cilium or flagellum. Therefore, it comes first in the sequence. 4. **Identify the Peripheral Microtubules**: Next, the peripheral microtubules (E) are located just beneath the plasma membrane. They form the outer ring of the structure. 5. **Locate the Radial Spokes**: The radial spokes (C) extend from the peripheral microtubules towards the central sheath and central microtubules. They are positioned after the peripheral microtubules in the sequence. 6. **Central Sheath Position**: The central sheath (A) surrounds the central microtubules and comes next in the sequence. 7. **Central Microtubules**: Finally, the central microtubules (B) are at the center of the arrangement and are the innermost part. ### Final Sequence: Based on the arrangement, the correct centripetal sequence is: 1. D. Plasma membrane 2. E. Peripheral microtubules 3. C. Radial spoke 4. A. Central sheath 5. B. Central microtubule Thus, the correct answer is **D, E, C, A, B**.
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