Multiple Choice
Which structure is NOT found in a typical prokaryotic cell?
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1. Overview of Cell Biology
Prokaryotic Cell Architecture
Multiple Choice
In prokaryotic cell architecture, what is the primary function of pili in many bacterial cells?
A
Attachment to surfaces and, in some species, DNA transfer during conjugation
B
ATP production through oxidative phosphorylation on internal membrane folds
C
Protein synthesis by translating mRNA into polypeptides
D
Protection against osmotic lysis by providing rigid mechanical support like peptidoglycan
Verified step by step guidance1
Step 1: Understand the structure and function of pili in prokaryotic cells. Pili are hair-like appendages found on the surface of many bacterial cells.
Step 2: Recognize that pili primarily serve to help bacteria attach to surfaces, which is crucial for colonization and infection processes.
Step 3: Note that in some bacterial species, specialized pili called sex pili facilitate the transfer of DNA between cells during a process known as conjugation.
Step 4: Differentiate pili from other cellular components: ATP production occurs in membrane folds (not pili), protein synthesis happens in ribosomes, and protection against osmotic lysis is provided by the cell wall, particularly peptidoglycan.
Step 5: Conclude that the primary function of pili is attachment to surfaces and, in some cases, DNA transfer during conjugation.
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