​When a Muscle Fiber Is Relaxed, Myosin Cannot Bind to Actin

question 49

Multiple Choice

​When a muscle fiber is relaxed, myosin cannot bind to actin because ____.

• A) ​ATP is not present
• B) ​the myosin binding site on actin is blocked
• C) ​the myosin head is in the wrong shape for binding
• D) ​the actin is in the wrong orientation for myosin binding
• E) ​the myosin head is 180 degrees from its attachment configuration

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Definitions:

Collateral Trust Bond

A type of bond that is secured by a pledge of collateral, typically securities, placed under the trust of a third party.

Securities

Financial instruments representing ownership (stocks), a debt agreement (bonds), or rights to ownership (derivatives) that can be bought and sold in financial markets.

Equipment

Physical assets used in the operation of a business, including machinery, tools, and vehicles.

Floating-Rate Bonds

Bonds whose interest payments fluctuate with market interest rates.