A rare genetic mutation results in an altered form of tropomyosin that remains permanently bound over the myosin-binding sites on actin filaments, regardless of the presence of calcium ions (Ca2+\text{Ca}^{2+}Ca2+).
Explain how this mutated tropomyosin prevents muscle contraction.
3 exam-style questions on AQA A Level Biology Skeletal muscles are stimulated to contract by nerves and act as effectors (A-level only), covering Skeletal muscles are stimulated to contract by nerves and act as effectors (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.