Refer to the following paragraph and accompanying figure to answer the following question(s).
-Gramicidin is an antibiotic that increases the permeability of bacterial cell walls to inorganic ions. What is the most likely mode of action of gramicidin?
A) It acts by active transport.
B) It causes membranes to fuse with one another.
C) It forms a channel in the membrane.
D) It removes electrical charges from solutes.

Question

Refer to the following paragraph and accompanying figure to answer the following question(s). 
-Gramicidin is an antibiotic that increases the permeability of bacterial cell walls to inorganic ions. What is the most likely mode of action of gramicidin?
A) It acts by active transport. 
B) It causes membranes to fuse with one another. 
C) It forms a channel in the membrane. 
D) It removes electrical charges from solutes.

Quizplus · Accepted Answer

The accompanying figure shows a schematic of gramicidin (highlighted in yellow) forming a channel in a membrane. This channel allows inorganic ions to freely pass through the membrane, increasing permeability. Therefore, the most likely mode of action of gramicidin is by forming a channel in the membrane.

Refer to the Following Paragraph and Accompanying Figure to Answer