Q: Which of the following equations best represents the process by which retroviruses synthesize DNA from their RNA genome?

$$RNA \xrightarrow{\text{reverse transcriptase}} DNA$$

Question 1

Which of the following RNA virus families is known for containing viruses with a positive-sense, single-stranded RNA genome, is non-enveloped, and includes the causative agent of poliomyelitis?

Accepted Answer

Picornaviridae

Question 2

A patient presents with acute hepatitis after consuming contaminated water. The causative agent is a non-enveloped, positive-sense, single-stranded RNA virus. Which virus family is most likely responsible?

Accepted Answer

Hepeviridae

Question 3

Which RNA virus family is characterized by a segmented, negative-sense, single-stranded RNA genome and is responsible for causing influenza?

Accepted Answer

Orthomyxoviridae

Question 4

A new outbreak of hemorrhagic fever is reported in Central Africa. The causative agent is an enveloped, filamentous, negative-sense RNA virus. Which family does this virus most likely belong to?

Accepted Answer

Filoviridae

Question 5

Which of the following virus families is unique among RNA viruses for having a double-stranded RNA genome?

Accepted Answer

Reoviridae

Question 6

A child develops a severe respiratory infection. The causative agent is an enveloped, negative-sense, single-stranded RNA virus known for causing measles. Which family does this virus belong to?

Accepted Answer

Paramyxoviridae

Question 7

Which RNA virus family is known for its ability to integrate its genome into the host DNA using the enzyme reverse transcriptase?

Accepted Answer

Retroviridae

Question 8

A patient is diagnosed with rabies after being bitten by a wild animal. The causative agent is an enveloped, bullet-shaped, negative-sense RNA virus. Which family does this virus belong to?

Accepted Answer

Rhabdoviridae

Question 9

Which of the following virus families includes the causative agents of dengue fever and yellow fever, both of which are transmitted by mosquitoes?

Accepted Answer

Flaviviridae

Question 10

A patient presents with symptoms of norovirus infection after a cruise. Which virus family is responsible for this outbreak?

Accepted Answer

Caliciviridae

Question 11

Which of the following RNA virus families is known for causing rubella and is transmitted via respiratory droplets?

Accepted Answer

Togaviridae

Question 12

Which virus family is responsible for the COVID-19 pandemic and is characterized by a positive-sense, single-stranded RNA genome and a crown-like appearance under electron microscopy?

Accepted Answer

Coronaviridae

Question 13

A virus is found to have a segmented, negative-sense, single-stranded RNA genome and is transmitted by arthropods. Which family does it most likely belong to?

Accepted Answer

Bunyaviridae

Question 14

Which of the following virus families is non-enveloped and contains the causative agent of rotavirus gastroenteritis in children?

Accepted Answer

Reoviridae

Question 15

Which of the following best describes the genome of viruses in the Parvoviridae family?

Accepted Answer

Single-stranded DNA

Question 16

A vaccine is available for which of the following RNA virus families, providing protection against a disease that can cause severe neurological complications?

Accepted Answer

Picornaviridae (Poliovirus)

Question 17

Which of the following equations best represents the process by which retroviruses synthesize DNA from their RNA genome?

Accepted Answer

$$RNA \xrightarrow{	ext{reverse transcriptase}} DNA$$

Question 18

A patient develops severe encephalitis after being bitten by a mosquito. The virus is enveloped, positive-sense, single-stranded RNA, and belongs to a family that also includes rubella. Which family is this?

Accepted Answer

Togaviridae

Question 19

Which of the following best explains why influenza viruses can cause pandemics, based on their genome structure?

Accepted Answer

Their segmented genome allows for reassortment, leading to antigenic shift.

Question 20

A laboratory is testing a new antiviral drug that targets the viral envelope. Which of the following virus families would NOT be affected by this drug?

Accepted Answer

Picornaviridae

Pathogenic RNA Viruses: Families, Characteristics, and Disease Review

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