Question

The cilia and flagella both:

• A. Have 9+2 arrangement of microtubules.
• B. Are the protective structures of cells.
• C. Are present only in protozoan animals.
• D. Are present as outgrowths of cytoplasm.

Answer 1

The correct option is A Have 9+2 arrangement of microtubules.

A cilium is an organelle found in eukaryotic cells. Cilia are slender protuberances that project from the much larger cell body. Inside cilia and flagella, is a microtubule-based cytoskeleton called the axoneme. The axoneme of primary cilia typically has a ring of nine outer microtubule doublets (called a 9+0 axoneme) and the axoneme of a motile cilium has two central microtubule singlets in addition to the nine outer doublets (called a 9+2 axoneme). A flagellum is a lash-like appendage that protrudes from the cell body of certain prokaryotic and eukaryotic cells. Flagella also has a 9+2 arrangement of microtubules. They both contain inner growth along with outer growth of cytoplasm. They both are not protective structures.