Multiple Choice
In a typical prokaryotic cell, where is the cell’s DNA primarily found?
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1. Overview of Cell Biology
Prokaryotic Cell Architecture
Multiple Choice
In prokaryotic cell architecture, what is the primary function of a plasmid?
A
To compartmentalize metabolic pathways by forming a membrane-bound organelle for ATP production
B
To serve as the main site of ribosomal RNA synthesis and ribosome subunit assembly
C
To form a rigid outer layer that prevents osmotic lysis by providing peptidoglycan-based structural support
D
To carry extra-chromosomal genes that can provide selectable advantages such as antibiotic resistance and be transferred between cells
Verified step by step guidance1
Step 1: Understand what a plasmid is in the context of prokaryotic cells. A plasmid is a small, circular, double-stranded DNA molecule that exists independently of the chromosomal DNA.
Step 2: Recognize that plasmids are not membrane-bound organelles and do not compartmentalize metabolic pathways or produce ATP. This eliminates options related to organelle functions.
Step 3: Recall that the main site of ribosomal RNA synthesis and ribosome assembly in prokaryotes is the nucleoid region, not plasmids, so plasmids do not serve this function.
Step 4: Understand that the rigid outer layer providing structural support and preventing osmotic lysis is the cell wall, composed mainly of peptidoglycan, not plasmids.
Step 5: Conclude that plasmids primarily carry extra-chromosomal genes that can provide selective advantages, such as antibiotic resistance, and can be transferred between cells, which is their key biological role.
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