If One Would Like to Use the Voltage Clamp Technique

question 32

Multiple Choice

If one would like to use the voltage clamp technique to record presynaptic calcium currents from a nerve terminal, why are tetrodotoxin (TTX) and tetraethylammonium (TEA) used?

• A) TTX blocks potassium channels and TEA blocks sodium channels.
• B) TTX blocks sodium channels and TEA blocks potassium channels.
• C) TTX blocks calcium channels and TEA blocks potassium channels.
• D) TTX blocks sodium channels and TEA blocks calcium channels.
• E) TTX blocks sodium channels and TEA blocks chloride channels.

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Definitions:

Excavates

A group of unicellular organisms, often flagellates, characterized by a distinct cellular structure, including a feeding groove.

Symbiotic Relationships

Interactions between two different organisms living in close physical association, typically to the advantage of both.

Larger Cells

Cells that are significantly above the average size, which can occur in various organisms and may have specific functional adaptations.

Bacteria

Single-celled microorganisms that can be found in a wide range of environments; some cause disease while others are beneficial.