Multiple Choice
Which of the following has never been found in a virus?
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18. Viruses, Viroids, & Prions
Animal Viruses: DNA Virus Synthesis & Replication
Multiple Choice
What step is required in the synthesis of ssDNA viruses that is not required in the synthesis of dsDNA viruses?
A
The viral ssDNA must be converted to dsDNA before it can be transcribed.
B
The viral ssRNA must be converted to dsRNA before it can be translated.
C
The viral ssDNA must be replicated before it can be transcribed.
D
All of the steps required to synthesize ssDNA and dsDNA viruses are the same.
Verified step by step guidance1
Understand the basic difference between single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA) viruses. ssDNA viruses have a single strand of DNA, whereas dsDNA viruses have two complementary strands.
Recognize that transcription requires a double-stranded template. In the case of ssDNA viruses, the single strand must be converted into a double-stranded form before transcription can occur.
Identify the process of converting ssDNA to dsDNA. This involves the synthesis of a complementary strand to the existing ssDNA, resulting in a double-stranded DNA molecule.
Compare the synthesis processes of ssDNA and dsDNA viruses. Note that dsDNA viruses already have the necessary double-stranded template for transcription, so this conversion step is not required for them.
Conclude that the unique step required for ssDNA viruses is the conversion of ssDNA to dsDNA, which is essential for transcription to proceed.
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