Cilia and Flagella are Most Similar in ____

Question

Cilia and flagella are most similar in ____.  
A) length
B) the kinds of cells that have them
C) the number that cells usually have
D) their internal composition and structure
E) their location along the cell's periphery

Accepted Answer

Cilia and flagella are both made up of microtubules arranged in a 9+2 pattern, with nine pairs of microtubules forming a ring around two central microtubules. They also share similar internal organelles, such as dynein arms, which help generate movement. Additionally, both cilia and flagella are found along the periphery of cells and are used for motility. Therefore, their internal composition and structure are most similar.