Question

Flagella, centrioles, cilia and basal bodies possess evident similar structural elements and arrangements. This can lead to this probable hypothesis.
(a) Loss of basal bodies should lead to loss of all cilia, flagella, and centrioles
(b) Disruption of one of these types of structure should necessarily disrupt each of the others as well
(c) Natural selection for motility must select for microtubular arrays in circular patterns
(d) Most proteins such as dynein must have evolved before any of these four kinds of structure

Answer 1

Hint:
Multiciliated motile cilia consist of an axoneme of nine doublet microtubules and a central pair of singlet microtubules (9+2 ) arrangement. In contrast to motile cilia, the axoneme of non-motile cilia lacks the central pair of singlet microtubules (9+0). The walls of the centriole are composed of nine triplet microtubules (9+0) arrangement.

Complete step by step answer:
Flagella is a locomotory organ present in many prokaryotes and eukaryotes. Eukaryotic flagella are different from prokaryotic flagella. Eukaryotic flagella have a specialized arrangement of microtubules. A flagellum has two components- A filament and a basal body. A filament possesses a bundle of microtubules, called an axoneme, it consists of microtubules, nine pairs of microtubules margin two single central microtubules. This is termed the 9+2 arrangement. All the microtubules have the same polarity: the plus ends are located at the distal tip. All of them have a microtubular arrangement.

Option ‘C’ is correct

Note:
In flagella, A tubule is a complete microtubule with 13 protofilaments, while the B tubule contains 10 protofilaments. The junctions between A and B tubules of one doublet are strengthened by tektin protein. The second linker radial spokes, which radiate from the central singlets to each A tubule of the outer doublets, form the third linker system