Question
Biology Question on locomotion and movement
Which of the following is the contractile protein of a muscle?
A
tropomyosin
B
tubulin
C
myosin
D
all of these.
Answer
myosin
Explanation
Solution
Myosin is a contractile protein of muscle. Primary myofilaments are made up of this protein. Each myosin filament is a polymerised protein made of many monomeric protein called meromyosins. Secondary myofilaments are composed of a protein actin, having with it two regulatory proteins : tropomyosin and troponin. Myosin interacts with actin to bring about contraction of muscle or cell movement. Tubulin is a protein of which the microtubules of cells are formed.