1. Which of the following are true in regard to microfilaments? A. Nucleation Is
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Question
1. Which of the following are true in regard to microfilaments?
A. Nucleation Is the rate-limiting step in the formation of microfilaments.
B. Microfilaments are symmetrical.
C.Microfilaments are composed of actin dimers.
D. Thymosin binds to actin and causes microfilament elongation.
2. Which of the following are true in regard to muscle contraction? (SELECT ALL THAT APPLY)
A. The regulatory proteins tropomyosin and troponin regulate the availability of myosin-binding sites on actin filaments in a calcium-dependent manner.
B. A sudden rise in calcium in the cytosol initiates muscle contraction.
C. Skeletal muscle myosin monomers form asymmetric parallel fibers through their motor domain.
D. The motor protein myosin generates the force for muscle contraction.
Explanation / Answer
Which of the following are true in regard to microfilaments?
Nucleation is the rate limiting step in the formation of microfilaments.
Thymidine binds to actin and causes microfilament elongation.
Microfilaments are composed of actin polymers.
Which of the following are true in regard to muscle contraction?
The regulatory proteins tropomyosin and troponin regulate the availability of myosin-binding sites on actin filaments in a calcium dependant manner.
The motor protePr myosin generates the force for muscle contraction.
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