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Chapter 12: Problem 11

Which of the following statements about cross-bridges is false? a. They are composed of myosin. b. They bind to ATP after they detach from actin. c. They contain an ATPase. d. They split ATP before they attach to actin.

Short Answer

Expert verified
The question is incorrect as there is no false statement among the given options. All statements (a, b, c, and d) about cross-bridges are true.

Step by step solution

01

Analyzing statement "a"

Cross-bridges are formed by the interaction of myosin and actin during muscle contraction. They are mainly composed of myosin, more specifically, the myosin head. So, statement "a" is true. Step 2: Analyzing statement "b"
02

Analyzing statement "b"

Once the muscle contraction finishes and cross-bridges need to be detached, myosin heads bind to a new ATP molecule. This causes the cross-bridge to detach from the actin filament. Hence, statement "b" is also true. Step 3: Analyzing statement "c"
03

Analyzing statement "c"

ATPase is an enzyme that catalyzes the hydrolysis of ATP (adenosine triphosphate) into ADP (adenosine diphosphate) and an inorganic phosphate molecule. The myosin head is also known as the myosin ATPase because it contains an ATPase site. The ATPase activity of myosin powers muscle contraction. Thus, statement "c" is true. Step 4: Analyzing statement "d"
04

Analyzing statement "d"

Before a cross-bridge can form between myosin and actin, the myosin head first binds to ATP. The ATP is then hydrolyzed to ADP and an inorganic phosphate molecule by ATPase activity. The myosin head remains attached to ADP and inorganic phosphate in a high-energy state until it binds to actin. Therefore, the statement "d" is also true. Since all the statements are true, it means that the given exercise has no false statement. So, the question is incorrect as there is no false statement among the given options.

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Most popular questions from this chapter

As ADP and ? are released from a myosin head, a. actin filaments move toward the H zone. b. myosin cross-bridges pull the thin filaments. c. a sarcomere shortens. d. Only a and care correct. e. All of these are correct.

The thick filaments of a muscle fiber are made up of a. actin. b. troponin. c. fascia. d. myosin.

How does the muscular system help maintain homeostasis? (pages \(269,271)\)

Impulses that move down the T system of a muscle fiber most directly cause a. movement of tropomyosin. b. attachment of the cross-bridges to myosin. c. release of \(\mathrm{Ca}^{2+}\) from the sarcoplasmic reticulum. d. splitting of ATP.

What criteria are used to name muscles? Give an example of each one. (pages 256,258 )
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