Multiple Choice
Microtubules are arranged in which of the following arrays?
304
views
15. Cytoskeleton and Cell Movement
Cilia and Flagella
Multiple Choice
Cilia and flagella differ from each other primarily in which of the following aspects?
A
Their length and pattern of movement
B
The type of motor protein used for movement
C
Their basic 9+2 arrangement of microtubules
D
The presence of microtubules in their structure
Verified step by step guidance1
Understand the structural similarities between cilia and flagella: Both cilia and flagella share a common structural framework, which includes the '9+2 arrangement' of microtubules. This refers to nine doublet microtubules arranged in a circle around two central singlet microtubules, a feature of eukaryotic cilia and flagella.
Recognize the motor protein involved in their movement: Both cilia and flagella use the motor protein dynein to generate movement. Dynein causes sliding between adjacent microtubule doublets, which is converted into bending motions.
Differentiate their length: Cilia are generally shorter and more numerous on the cell surface, while flagella are longer and typically fewer in number (often one or two per cell).
Differentiate their movement patterns: Cilia exhibit a back-and-forth or wave-like motion, which is often coordinated across multiple cilia to move fluid or particles. Flagella, on the other hand, exhibit a whip-like or propeller-like motion, which is used to propel the cell forward.
Eliminate incorrect options: Since both cilia and flagella share the 9+2 arrangement of microtubules and use dynein as the motor protein, these cannot be the distinguishing factors. The correct distinguishing features are their length and pattern of movement.
Related Videos
Related Practice
