[Campbell Biology P.163] Which statement accurately describes the structure of centrioles wi... | Practice Question
Which statement accurately describes the structure of centrioles within a centrosome, as depicted and described in Figure 6.22?
A: A centrosome contains a single centriole, composed of nine sets of doublet microtubules.
B: Centrioles are arranged parallel to each other and each measures approximately 250 µm in diameter.
C: Each centriole is made up of nine sets of triplet microtubules arranged in a ring, and the two centrioles are at right angles to each other.
D: Nontubulin proteins primarily form the core of the centriole, rather than connecting microtubule triplets.
E: Centrosomes are found in all eukaryotic cells and always contain centrioles.
Explanation
Figure 6.22 and the accompanying text state that a centrosome contains a pair of centrioles, each composed of nine sets of triplet microtubules arranged in a ring, and the two centrioles are at right angles to each other. Nontubulin proteins connect the microtubule triplets.