Porin proteins form large, barrel-like channels in the membrane. Which of the following is not true about these channels?

Porin proteins form large, barrel-like channels in the membrane. Which of the following is not true about these channels?



(a) They are made primarily of a helices.
(b) They are made primarily of ß sheets.
(c) They cannot form narrow channels.
(d) They have alternating hydrophobic and hydrophilic amino acids.




Answer: 




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