Question 1

Which of the following DNA virus families is unique in having a genome that is partially single-stranded and partially double-stranded DNA?

Accepted Answer

Hepadnaviridae

Question 2

A patient presents with jaundice, liver enlargement, and abdominal distress. Laboratory tests reveal the presence of Dane particles in the blood. Which virus is most likely responsible for these symptoms?

Accepted Answer

Hepatitis B virus

Question 3

Which of the following best describes the structure of Adenoviridae?

Accepted Answer

Naked, icosahedral capsid with spikes, double-stranded DNA

Question 4

Which of the following is a significant risk factor for developing hepatic cancer?

Accepted Answer

Chronic infection with Hepatitis B virus

Question 5

A child develops a 'slapped cheek' rash that worsens with sunlight exposure. Which virus is most likely responsible?

Accepted Answer

Parvovirus B19

Question 6

Which of the following statements about Hepatitis B virus (HBV) replication is correct?

Accepted Answer

HBV uses reverse transcriptase to transcribe its DNA genome into RNA.

Question 7

Which of the following is NOT a common route of transmission for Hepatitis B virus?

Accepted Answer

Respiratory droplets

Question 8

Which of the following best explains why vaccination has reduced the incidence of Hepatitis B in the United States?

Accepted Answer

Vaccination provides long-term immunity by stimulating the production of antibodies against HBV antigens.

Question 9

Which of the following is a distinguishing feature of Parvoviridae compared to other human DNA viruses?

Accepted Answer

It is the only human DNA virus with a single-stranded DNA genome.

Question 10

Adenoviruses are known to cause all of the following EXCEPT:

Accepted Answer

Jaundice

Question 11

Which of the following statements about the diagnosis of Hepatitis B infection is correct?

Accepted Answer

Diagnosis is based on the detection of viral antigens in body fluids.

Question 12

Which of the following best describes the effect of coinfection with Hepatitis D virus in a patient with chronic Hepatitis B?

Accepted Answer

It increases the risk of permanent liver damage.

Question 13

Which of the following is a recommended prevention strategy for Hepatitis B virus transmission?

Accepted Answer

Abstinence and monogamy

Question 14

Which of the following is true regarding the three types of viral particles produced by Hepatitis B virus?

Accepted Answer

Only Dane particles are infectious.

Question 15

Adenoviruses can survive on fomites and in improperly chlorinated water. What does this imply about their structure?

Accepted Answer

They are naked viruses, which makes them more resistant to environmental conditions.

Question 16

Which of the following best explains why chronic carriers of Hepatitis B are at increased risk for hepatic cancer?

Accepted Answer

The HBV genome integrates into hepatic cells, potentially disrupting normal cell regulation.

Question 17

Which of the following treatments is available for adenovirus infections?

Accepted Answer

Cidofovir

Question 18

Which of the following equations best represents the relationship between the number of viral particles ($$N$$), the rate of release ($$r$$), and time ($$t) $$for a virus that is continually released from infected cells?

Accepted Answer

$$N = r 	imes t$$

Question 19

Which of the following statements about the epidemiology of Hepatitis B in the United States is supported by the data?

Accepted Answer

The introduction of the vaccine led to a significant decrease in the incidence of acute Hepatitis B.

Question 20

Which of the following best describes the genome of Parvovirus B19?

Accepted Answer

Single-stranded DNA

Pathogenic DNA Viruses: Structure, Taxonomy, and Clinical Significance

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