Question

About the selectivity of K+ channels, which statement is WRONG?

A. The protein segments constituting the selectivity filters are homologous in all K+ channels.
B. K+ passes through the channel without hydrated water shells.
C. Na+ cannot pass through K+ channel because it could not interact efficiently with the interior selective groups lining the channel.
D. K+ moves against its gradient.

Answer 1

The statement that is WRONG about the selectivity of K+ channels is that Na+ cannot pass through K+ channels.

Step-by-step explanation:

The statement that is WRONG about the selectivity of K+ channels is:

C. Na+ cannot pass through K+ channel because it could not interact efficiently with the interior selective groups lining the channel.

K+ channels are selective for K+ ions and exclude other ions, including Na+. The interior selective groups lining the channel are specifically designed to interact with K+ ions, allowing them to pass through while preventing other ions from doing so. This selectivity is crucial for maintaining the proper balance of ions across the cell membrane.