Multiple choice

In Gram-negative bacteria, the outer membrane is more permeable than the plasma membrane because _________.

  1. as compared to other membrane phospholipids, LPS is larger

  2. lipoproteins stretch the outer membrane

  3. the lipid bilayer is covered by core polysaccharides

  4. in the outer membrane, porin proteins make holes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the outer membrane, porin proteins make holes. Porin proteins are beta barrel proteins present in the Gram-negative bacteria that allows transport of large sized or charged molecules across the membrane by passive diffusion.

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