alleryThe band of a muscle fibril that contains only actin is the
AI-band
BA-band
CH-zone
DM-line
Answer & Solution
Correct answer: A. I-band
1. A muscle fibril shows alternating light and dark bands.
2. The light band contains actin and is called the I-band or isotropic band.
3. The dark band contains myosin and is called the A-band or anisotropic band.
4. So actin alone marks the I-band.
_Source: syllabus Biology Ch17 'Locomotion and Movement'_
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