Viewed with an electron microscope,a myofibril displays alternating dark bands (the A bands)and light bands (the I bands).

Question

Viewed with an electron microscope,a myofibril displays alternating dark bands (the A bands)and light bands (the I bands).​

Quizplus · Accepted Answer

This is a true statement. The striations observed in myofibrils under an electron microscope are due to the arrangement of the contractile proteins actin and myosin, which create the alternating light and dark bands. The A bands correspond to the length of the myosin filaments, while the I bands correspond to the regions between the myosin filaments where only actin is present.

Viewed with an Electron Microscope,a Myofibril Displays Alternating Dark Bands