Question

matching question
match the thin filament protein and thin filament associated protein names with its function.
instructions
troponin
tropomyosin
actin
bound to tropomyosin; can bind calcium ions
two intertwined strands; each bead has a myosin - binding site
two intertwined strands; cover myosin - binding sites

Explanation:

• Actin: It has two intertwined strands, and each bead (actin monomer) has a myosin - binding site.
• Tropomyosin: It is in two intertwined strands and covers the myosin - binding sites on actin when the muscle is at rest.
• Troponin: It is bound to tropomyosin and can bind calcium ions. When calcium binds to troponin, it causes a conformational change that moves tropomyosin away from the myosin - binding sites on actin.

Answer:

• "two intertwined strands; each bead has a myosin - binding site" matches with "actin".
• "two intertwined strands; cover myosin - binding sites" matches with "tropomyosin".
• "bound to tropomyosin; can bind calcium ions" matches with "troponin".