Multiple Choice
In prokaryotic cell architecture, bacterial cell walls are primarily composed of peptidoglycan and therefore lack which major structural component found in plant cell walls?
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1. Overview of Cell Biology
Prokaryotic Cell Architecture
Multiple Choice
In prokaryotic cell architecture, which structure primarily protects the cell from mechanical injury and osmotic lysis?
A
Plasma (cytoplasmic) membrane
B
Ribosomes (70S)
C
Peptidoglycan cell wall
D
Nucleoid region (chromosomal DNA)
Verified step by step guidance1
Identify the main components of a prokaryotic cell relevant to protection and structural integrity: plasma membrane, ribosomes, peptidoglycan cell wall, and nucleoid region.
Understand the function of the plasma (cytoplasmic) membrane: it controls the movement of substances in and out of the cell but does not provide strong mechanical protection.
Recognize that ribosomes (70S) are involved in protein synthesis and do not contribute to physical protection or osmotic resistance.
Recall that the nucleoid region contains chromosomal DNA and is not a structural barrier against mechanical injury or osmotic pressure.
Focus on the peptidoglycan cell wall, which is a rigid layer outside the plasma membrane that provides mechanical strength and prevents osmotic lysis by maintaining cell shape and resisting internal turgor pressure.
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