Question

Which of the following prokaryotic cells contain an outer membrane?

A) Gram-negative bacteria only
B) Gram-positive bacteria only
C) both Gram-positive and Gram-negative bacteria
D) archaea
E) all prokaryotes

Answer 1

Only Gram-negative bacteria contain an outer membrane, which distinguishes them from Gram-positive bacteria with a thick cell wall and archaea which lack peptidoglycan and an outer membrane.option a is correct

Step-by-step explanation:

The correct answer to the question of which prokaryotic cells contain an outer membrane is that Gram-negative bacteria only have an outer membrane. This differentiates them from Gram-positive bacteria, which do not have an outer membrane but rather have a thick cell wall composed primarily of peptidoglycan. Unlike bacteria, archaea do not have peptidoglycan in their cell walls and also do not have an outer membrane.

Gram-negative bacteria have a thin cell wall that is surrounded by an outer membrane containing lipopolysaccharides and lipoproteins. This membrane includes protein structures known as porins that allow substances to enter the cell. In contrast, Gram-positive bacteria have a thicker peptidoglycan wall that is anchored to the cell membrane by lipoteichoic acid, but lacks an outer membrane.