Question

The globular head of HMM is an active ATPase enzyme and has
a. ATP binding sites
b. Actin binding sites
c. Myosin binding sites
d. Troponin binding sites
e. Calcium binding sites

• A. $a,c$ and $d$
• B. $a,c$ and $e$
• C. $a$ and $b$
• D. $a$ and $c$

Answer 1

The correct option is C $a$ and $b$

Sarcomere
The sarcomere is the functional unit of contraction in the myofibril. It is made up of thick and thin filaments.

Myosin filament or the thick filament
The myosin filament or the thick filament is a polymer of meromyosin. Each meromyosin is made of two subunits, a heavy meromyosin (HMM) and a light meromyosin (LMM).

HMM
HMM has -

• Actin binding site
• ATP binding site