Question

what happens as a result of protein channels being selective towards certain molecules? any molecule can pass through a protein channel. the molecules will teleport around the channels. only one type of molecule can pass through a certain protein channel.

Explanation:

• Analyze the first option: If protein channels are selective, they don't allow any molecule to pass, so this is incorrect.
• Analyze the second option: Teleportation is not a biological process related to protein channels, so this is incorrect.
• Analyze the third option: Selective protein channels mean they allow only specific (one type, in the context of the option) molecules to pass, which matches the concept of selectivity.

Answer:

C. Only one type of molecule can pass through a certain protein channel. (Note: Assuming the third option is labeled as C; if the original labels were different, adjust the identifier. Here, based on the order, the correct option is the third one with the text "Only one type of molecule can pass through a certain protein channel.")