Mutations in the Gene for Troponin Can Result in the Production

question 22

Multiple Choice

Mutations in the gene for troponin can result in the production of the troponin protein, which has varying affinities for Ca²⁺ ions. Suppose that in a muscle cell a mutant troponin is expressed that has such a high affinity for Ca²⁺ ions that once they bind to troponin they cannot unbind. What will likely happen in this muscle cell?

• A)Myosin heads will not bind to actin after action potentials stop being received.
• B)Myosin heads will bind to actin after action potentials stop being received.
• C)Tropomyosin will not move to expose myosin binding sites.
• D)Cross-bridges will form between myosin and tropomyosin.

Distinguish between fixed (or pegged) and flexible exchange rate policies.

Comprehend the economic implications of persistent U.S. trade deficits.

Identify the major components of the current and capital and financial accounts in the balance of payments, and how these balances are determined.

Analyze how exchange rates are determined in flexible and managed floating exchange rate systems.

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