Multiple Choice
Which type of cell does not contain a nucleus?
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1. Overview of Cell Biology
Prokaryotic Cell Architecture
Multiple Choice
In a prokaryotic cell, what is the primary role of a plasmid?
A
It is the protein-synthesizing structure where mRNA is translated into polypeptides.
B
It is the rigid outer layer made of peptidoglycan that maintains cell shape and prevents lysis.
C
It is a small circular DNA molecule that replicates independently of the chromosome and often carries genes such as antibiotic-resistance genes.
D
It is the membrane-bound organelle responsible for ATP production through oxidative phosphorylation.
Verified step by step guidance1
Identify the key structures mentioned in the problem: plasmid, protein-synthesizing structure, rigid outer layer, and membrane-bound organelle for ATP production.
Recall that plasmids are small, circular DNA molecules found in prokaryotic cells that exist independently of the chromosomal DNA.
Understand that plasmids often carry genes that provide advantageous traits, such as antibiotic resistance, which can be transferred between bacteria.
Differentiate plasmids from other cell components: ribosomes (protein synthesis), cell wall (rigid outer layer), and mitochondria (ATP production, which prokaryotes lack).
Conclude that the primary role of a plasmid is to carry genetic information independently of the main chromosome, often including genes like those for antibiotic resistance.
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