The nucleic acid of a virus is
DNA only
RNA only
DNA and RNA
Either DNA or RNA
The Correct Answer is D
A. DNA only: Some viruses have DNA genomes, but this statement excludes RNA viruses.
B. RNA only: Some viruses have RNA genomes, but this statement excludes DNA viruses.
C. DNA and RNA: Individual virions generally do not contain both DNA and RNA as their genome.
D. Either DNA or RNA: Viral genomes are composed of either DNA or RNA (single- or double-stranded), but not both in the same virion.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Mycoplasma: Mycoplasma (especially Mycoplasma pneumoniae) is the usual cause of atypical or “walking” pneumonia.
B. Corynebacterium: Corynebacterium diphtheriae causes diphtheria rather than walking pneumonia.
C. Streptococcus pneumonia: Streptococcus pneumoniae commonly causes typical lobar pneumonia, often more severe than walking pneumonia.
D. Aemophilus: (Likely intended Haemophilus) Haemophilus species can cause respiratory infections but are not the classic cause of walking pneumonia.
Correct Answer is C
Explanation
A. Endospores: Endospores are resistant survival forms produced by some bacteria (e.g., Bacillus, Clostridium), not a fungal reproductive structure.
B. Cysts: Cysts are dormant/survival forms often seen in protozoa; fungi typically reproduce via spores.
C. Spores: Fungi reproduce and disperse primarily via spores (asexual and sexual types such as conidia, sporangiospores, ascospores, basidiospores).
D. Eggs: Eggs are multicellular reproductive cells of animals; fungi don’t produce eggs as their main reproductive units.
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