A Group of Rats Are Bred in a Laboratory to Study

question 68

Multiple Choice

A group of rats are bred in a laboratory to study muscle function. This group possesses a genetic defect that causes troponin to be incorrectly synthesized, making it non-functional. Because of this, the rats are entirely paralyzed. Which of the following correctly explains the impact of the defect on the muscle?

• A)Troponin can't bind Ca⁺², which stops tropomyosin from pulling away to reveal actin binding spots on the thin filament.
• B)Troponin, when revealed by tropomyosin, won't be able to bind to the myosin heads of the thick filament.
• C)Troponin won't pull away to reveal the actin binding spots of the thin filament after tropomyosin binds Ca⁺².
• D)Troponin, when revealed by actin, won't be able to bind to the myosin heads of the thick filament.

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