Multiple Choice
Which term describes a toxin that is part of the outer membrane in a Gram-negative bacterial cell?
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7. Prokaryotic Cell Structures & Functions
Gram-Negative Cell Walls
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Which of the following correctly lists the main components of the cell envelope in a Gram-negative bacterium, from outside to inside?
A
Outer membrane, periplasmic space, peptidoglycan layer, cytoplasmic membrane
B
Cytoplasmic membrane, peptidoglycan layer, outer membrane, periplasmic space
C
Outer membrane, peptidoglycan layer, periplasmic space, cytoplasmic membrane
D
Peptidoglycan layer, outer membrane, cytoplasmic membrane, periplasmic space
Verified step by step guidance1
Step 1: Understand the structure of a Gram-negative bacterial cell envelope, which consists of multiple layers arranged from the outside to the inside of the cell.
Step 2: Identify the outermost layer, which is the outer membrane. This membrane contains lipopolysaccharides and serves as a protective barrier.
Step 3: Recognize that just beneath the outer membrane is the periplasmic space, a gel-like area containing the peptidoglycan layer and various enzymes.
Step 4: Note that within the periplasmic space lies the thin peptidoglycan layer, which provides structural support and shape to the bacterium.
Step 5: Finally, the innermost layer is the cytoplasmic (or inner) membrane, which controls the movement of substances into and out of the cell.
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