Multiple Choice
In prokaryotic cell architecture, which structure primarily protects the cell from mechanical injury and osmotic lysis?
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1. Overview of Cell Biology
Prokaryotic Cell Architecture
Multiple Choice
In prokaryotic cell architecture, what is the primary structural component of most bacterial cell walls?
A
Chitin, a polymer of N-acetylglucosamine found in fungal cell walls
B
Phospholipid bilayer with embedded cholesterol as the main rigid layer
C
Cellulose, a glucose polymer common in plant cell walls
D
Peptidoglycan (murein), a polymer of sugars cross-linked by short peptides
Verified step by step guidance1
Step 1: Understand the context of the question, which focuses on the primary structural component of bacterial cell walls in prokaryotic cells.
Step 2: Recall that bacterial cell walls provide shape and protection, and their main structural component is unique compared to eukaryotic cells like plants and fungi.
Step 3: Identify that chitin is a polymer found in fungal cell walls, not bacterial cell walls, so it can be excluded.
Step 4: Recognize that cellulose is a glucose polymer found in plant cell walls, so it is not the main component in bacteria.
Step 5: Know that the bacterial cell wall is primarily made of peptidoglycan (also called murein), which is a polymer consisting of sugars cross-linked by short peptides, providing rigidity and strength.
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