In a Muscle Cell, Myosin Binds to Actin to Cause

question 61

Multiple Choice

In a muscle cell, myosin binds to actin to cause muscle contraction. Researchers have found that rabbit muscle myosin binds to actin from an amoeba. How can this be?

• A)The myosin from amoeba and rabbits is similar due to a distant common ancestor.
• B)The differences in myosin between amoeba and rabbits do not affect the actin-binding site of myosin.
• C)Proteins whose functions are important to many types of organisms are more likely to be conserved.
• D)The myosin from amoeba and rabbits is similar due to a distant common ancestor, and the differences between them do not affect the actin binding site.
• E)All of these choices are correct.

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