Which of the following is NOT correct regarding the bands observed by electron microscopy of myofibrils?
A)I bands show a hexagonal array of thick filaments.
B)Thin filaments are composed mainly of actin,troponin,and tropomyosin.
C)H zones contain an array of thick filaments that are composed mainly of myosin.
D)Thick filaments are joined by cross-bridges.

Question

Quizplus · Accepted Answer

I bands do not show a hexagonal array of thick filaments. They contain only thin filaments and the Z discs that anchor them. It is the A bands that contain a hexagonal array of thick filaments.

Which of the Following Is NOT Correct Regarding the Bands