Zadanie 25
Identify the three proteins indicated in this original sarcomere model. A. P: myosin; Q: actin; R: collagen B. P: actin; Q: myosin; R: titin C. P: titin; Q: actin; R: myosin D. P: actin; Q: collagen; R: tubulin
- Materiał graficzny
Sarcomere shortening by filament sliding
Explain how interactions between actin and myosin shorten a sarcomere without shortening the filaments.
Tę umiejętność sprawdza 7 zadań wzorowanych na arkuszach IB z lat 2023–2026.
Zadania sprawdzające tę umiejętność: 7 Otwórz w wyszukiwarce z filtrami
Zadanie 15
Which pair of structures occurs in both mammalian cardiac muscle cells and skeletal muscle fibres? A. Chloroplasts and mitochondria B. Central vacuoles and cilia C. Cellulose walls and sarcomeres D. Sarcomeres and mitochondria
Zadanie 25
The drawing represents a shortened sarcomere. Which labelled feature increases in length when the sarcomere relaxes and stretches back? A. R, the length of a thin filament B. P, the distance between the two Z-discs C. S, the width of the central line D. Q, the…
- Materiał graficzny
Zadanie 3a
Outline the contribution of mitochondria to muscle-fibre function.
Zadanie 3b
Explain how actin and myosin produce sarcomere shortening.
Zadanie 7
(a) Outline translation of an mRNA molecule in the cytoplasm. (b) Describe how homologous proteins can provide evidence about evolutionary relationships. (c) Explain how proteins bring about skeletal muscle contraction.
Zadanie 38
Which description correctly relates the structural levels in skeletal muscle? A. A muscle fibre is typically multinucleate and contains myofibrils made of repeated sarcomeres B. Each sarcomere is a whole multinucleate muscle fibre C. Myosin makes cross-bridges…