Question

Which of the following does not reveal in the detailed analysis of a cilium from the human respiratory tract?
A) Tubulin
B) Plasmagel
C) Microtubules
D) Axoneme

Answer 1

Hint:
In living cells like amoeba the outer gel-like cytoplasm which do not reveal a detailed analysis of cilium. It is moved by the pseudopodium (the extruding part of the cell) in the direction of motion. In continuous flow forward of cytoplasm needed for forming pseudopodium, a reversible conversion of plasma gel is used.

Complete step by step answer:
Microtubules are hollow, cylindrical, polymerized, polarized and dynamic structures. They are present in all eukaryotic cells. The basic building block of a microtubule is an alpha-beta-tubulin heterodimer. It consists of alpha and beta tubulin. Tubulins are highly conserved globular proteins found in all eukaryotes.
In many prokaryotes and eukaryotes, flagella are present as an organ for locomotion. A specialized arrangement of microtubules is present in the flagella of eukaryotes. A flagellum has a basal body and a filament. The basal body is also called the kinetosome. A filament is a bundle of microtubules, called an axoneme, in which nine outer doublet microtubules surround a central pair of singlet microtubules. This is termed a 9+2 arrangement.
Plasmagel does not reveal in the detailed analysis of a cilium from the human respiratory tract.

Option ‘B’ is correct

Note:
Alpha subunits of all protofilaments face one end of the microtubule and the beta subunits face the opposite end. Beta subunits are exposed at the plus end i.e., fast-growing while the alpha subunits are exposed at the minus ends i.e., slow-growing end.