5 Questions
Which of the following is NOT a possible form of viral genetic material?
Double-stranded protein (dsProtein)
Positive-sense single-stranded RNA (+ssRNA) in viruses is most similar to which of the following?
mRNA
What type of genetic material allows a virus to directly transcribe a message?
Positive-sense single-stranded RNA (+ssRNA)
Which of the following is a characteristic of negative-sense single-stranded RNA (-ssRNA)?
It must first be converted to positive-sense RNA to be transcribed
What is required for a cell containing -ssRNA to produce proteins?
Conversion of -ssRNA to +ssRNA
Study Notes
Virus Structure
- Unlike cells, viruses have diverse genome structures, including double-stranded DNA (dsDNA), single-stranded DNA (ssDNA), double-stranded RNA (dsRNA), and single-stranded RNA (ssRNA).
- There are four types of viral genome structures: dsDNA, ssDNA, dsRNA, and ssRNA.
- Single-stranded RNA (ssRNA) viruses can be further classified into two categories: positive-sense (+ssRNA) and negative-sense (-ssRNA).
- Positive-sense (+ssRNA) viruses have a genome that can be directly translated into protein, similar to mRNA.
- Negative-sense (-ssRNA) viruses have a genome that must be transcribed into a complementary positive-sense RNA before it can be translated into protein.
This quiz covers the different forms of viral genomes, including double-stranded DNA, single-stranded DNA, double-stranded RNA, and single-stranded RNA. It also explains the difference between positive-sense and negative-sense RNA.
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