Myosin II is found in skeletal muscle and the contractile ring. It is a two-headed myosin with tails that can form thick filaments. Other myosins, such as myosin I or myosin V, do not form thick filaments and yet are still capable of producing movement along actin filaments. To what do the tail(s) of myosin I and myosin V bind?
A) Cargo such as membrane vesicles or intermediate filaments
B) Centrosomes
C) Chromosomes
D) Tubulin

Question

Quizplus · Accepted Answer

The tails of myosin I and myosin V can bind to cargo such as membrane vesicles or intermediate filaments for transport along actin filaments, but they do not form thick filaments like myosin II. Therefore, option A is the best choice. Myosin I and V are involved in intracellular transport, while myosin II is involved in muscle contraction and cytokinesis. Myosin I has a single head domain and is involved in short-range movements, while myosin V has two heads and is involved in long-range movements.

Myosin II Is Found in Skeletal Muscle and the Contractile