EDTA is a chemical that binds to and removes (chelates)divalent cations from solution. Treatment of isolated axonemes with EDTA leads to the removal of the inner and outer arms extending from the A microtubules of the axoneme. Which of the following statements would appear to be true based on this information?
A)Potassium ions are required for dynein to bind to the A tubules of the axoneme.
B)Chlorine ions are required for dynein to bind to the A tubules of the axoneme.
C)Magnesium ions are required for dynein to bind to the A tubules of the axoneme.
D)Magnesium ions are required for tubulin to bind to the A tubules of the axoneme.
E)Sodium ions are required for tubulin to bind to the A tubules of the axoneme.

Question

Quizplus · Accepted Answer

EDTA chelates divalent cations, and the removal of the inner and outer arms from the A microtubules suggests that these arms depend on divalent cations. Magnesium ions are the most common divalent cations in biological systems and are often required for protein-protein interactions, making them a likely candidate for the cations required for dynein arm binding to the A tubules. Therefore, choice C is the best option among the given choices. None of the other options make sense in the context of the information provided.

EDTA Is a Chemical That Binds to and Removes (Chelates)divalent