Cilia differ from flagella in that
A) cilia contain nine microtubule doublets surrounding a central pair of microtubules, whereas flagella contain only nine microtubule doublets.
B) the protein filaments of cilia are "naked," whereas those of flagella are wrapped in an extension of the cell membrane.
C) cilia are typically more numerous and shorter than flagella.
D) cilia are anchored only in the proteins of the cell membrane, whereas flagella are anchored in a special structure called the basal body.
Answer: C
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