Question

Label the correct part of the Myosin monomer.

• A. (i) Actin binding site (ii) Head (iii) ATP binding site (iv) Cross arm
• B. (i) Cross arm (ii) Actin binding site (iii) Head (iv) ATP binding site
• C. (i) ATP binding site (ii) Actin binding site (iii) Head (iv) Cross arm
• D. (i) Head (ii) Cross arm (iii) Actin binding site (iv) ATP binding site

Answer 1

Answer: (D)

(i) Head (ii) Cross arm (iii) Actin binding site (iv) ATP binding site

The globular part of the myosin is called Head. It helps to form cross-bridges by attaching with actin.

The middle oblique structure that connects head and tail of myosin is the neck. Head and neck together called as Cross arm. They are responsible for forming cross bridges and help in wilding of actin over myosin.

The topmost area on the head of the myosin is the actin-binding site. This site helps in attachment of myosin to actin.

ATP binding site is present anteriorly below actin binding site. This site attaches to the ATP and forms ADP. The energy is used for sliding of cross bridges.

So the correct option is D.