Multiple Choice
Which of the following would be clinically significant in determining the presence of an infection?
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1. Introduction to Microbiology
Introduction to Microbiology
Multiple Choice
Which of the following is a feature that may be found in viruses but never in bacteria?
A
A protein capsid surrounding genetic material
B
A cell wall composed of peptidoglycan
C
Circular double-stranded DNA genome
D
Ribosomes for protein synthesis
Verified step by step guidance1
Step 1: Understand the structural components of viruses and bacteria. Viruses are composed of genetic material (DNA or RNA) enclosed within a protein coat called a capsid, and sometimes an envelope. Bacteria are cellular organisms with complex structures including a cell wall, cytoplasm, and ribosomes.
Step 2: Analyze each option in the context of virus and bacterial features. For example, a cell wall composed of peptidoglycan is characteristic of bacteria but not viruses.
Step 3: Recognize that viruses do not have ribosomes for protein synthesis; they rely on host cells for this function, whereas bacteria have their own ribosomes.
Step 4: Note that circular double-stranded DNA genomes are common in bacteria, but viruses can have various types of genomes including RNA or linear DNA.
Step 5: Conclude that the presence of a protein capsid surrounding genetic material is unique to viruses and not found in bacteria, making it the distinguishing feature.
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