Which of the Following Statements About Cycloaddition Reactions Is Not

question 43

Multiple Choice

Which of the following statements about cycloaddition reactions is not true?

• A) Cycloaddition reactions form a cyclic product with two new  bonds.
• B) The course of the reaction is determined by the symmetry of the molecular orbitals of the products.
• C) Cycloaddition reactions are concerted.
• D) Cycloaddition reactions are stereospecific.

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Definitions:

M Line

Line in the center of the H zone made of delicate filaments that holds the myosin myofilaments in place in the sarcomere of muscle fibers.

Myosin Head

The globular part of the myosin protein that binds to actin filaments in muscle cells during contraction.

Troponin

A protein complex involved in the regulation of skeletal and cardiac muscle contraction, which binds to calcium ions causing a change that allows muscle contraction.

ATPase Activity

The enzymatic activity involved in hydrolyzing ATP (adenosine triphosphate) to release energy.