Final answer:
The statement that dark A bands and light I bands repeat along myofibrils, causing a striated appearance of the muscle cell, is true. This is a characteristic feature of skeletal muscle fibers, resulting from the orderly alignment of repeating sarcomeres within myofibrils.
Step-by-step explanation:
The statement that dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes the entire cell to appear striated is true. This striated appearance is characteristic of skeletal muscle tissue and results from the arrangement of actin and myosin protein filaments within the myofibrils. The repeating pattern of dark A bands and light I bands reflects the organization of these proteins into functional units called sarcomeres. With each consecutive sarcomere aligned end-to-end along a myofibril, this orderly pattern gives the muscle fiber its striated look that can be observed under a microscope.
The A band corresponds to the region where the thick (myosin) and thin (actin) filaments overlap, contributing to the darker appearance, while the I band is lighter because it primarily contains thin filaments. The Z disc or Z line runs through the middle of the I band and marks the boundary between adjacent sarcomeres.