Compare the structures of viruses to cells, describe viral reproduction, and describe the role of viruses in causing diseases such as human immunodeficiency virus (HIV) and influenza.
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Q 1/12
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The human immunodeficiency virus (HIV) often infects and destroys CD4 T cells. These CD4 T cells are one of many kinds of white blood cells that are an important part of the immune system. The most common danger related to the destruction of CD4 T cells is —
30
a decrease in the flow of blood to vital organs
a decrease in the amount of oxygen being transported to tissues
an increase in the threat of diseases caused by microorganisms and viruses
an increase in the risk of high blood pressure
Q 2/12
Score 0
Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. Once a virus gains entry to the body, it invades a host cell in order to —
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access cellular processes for replication
metabolize host proteins and grow
synthesize antibodies for defense
deactivate the host cell’s defenses
12 questions
Q.
The human immunodeficiency virus (HIV) often infects and destroys CD4 T cells. These CD4 T cells are one of many kinds of white blood cells that are an important part of the immune system. The most common danger related to the destruction of CD4 T cells is —
1
30 sec
B.4.C: Viruses
Q.
Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. Once a virus gains entry to the body, it invades a host cell in order to —
2
30 sec
B.4.C: Viruses
Q.
The 1918 influenza epidemic killed between 50 million and 100 million people worldwide. This epidemic happened near the end of World War I. More people died from the influenza epidemic than were killed in the war. Which of the following explains why this virus was so deadly worldwide?
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30 sec
B.4.C: Viruses
Q.
The picture shows a 3-D model of a virus called a bacteriophage. Bacteriophages can infect bacteria such as E. coli. In what way are the bacteriophage and E. coli alike?
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30 sec
B.4.C: Viruses
Q.
Models of the human immunodeficiency virus (HIV) and an animal cell are shown below. What is the difference in the function of the glycoprotein structures of an HIV virion and the cilia of an animal cell?
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30 sec
B.4.C: Viruses
Q.
H1N1 flu is a highly contagious viral infection caused by the influenza A (H1N1) virus. The symptoms of H1N1 flu are listed in the box below. An antiviral agent administered within 48 hours of the appearance of symptoms can reduce the severity of the illness. Why is it important to administer an antiviral agent to an infected person within 48 hours of the appearance of symptoms?
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B.4.C: Viruses
Q.
A person infected with the human immunodeficiency virus (HIV) may not have any symptoms for a period of time. During this period the virus affects the body by doing which of the following?
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30 sec
B.4.C: Viruses
Q.
Severe acute respiratory syndrome (SARS) is an illness caused by a coronavirus. Symptoms including a high fever, headaches, and body aches typically occur two to seven days after infection by the virus. SARS is more serious in elderly patients. This information suggests that the reproductive cycle of the SARS virus is —
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30 sec
B.4.C: Viruses
Q.
A photograph of a virus is shown below.
The projections on the surface of this virus allow the virus to —
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30 sec
B.4.C: Viruses
Q.
Cold sores are caused by the herpes simplex virus type 1. A company that wants to develop antiviral drugs would ask a research immunologist to study —
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30 sec
B.4.C: Viruses
Q.
In the 1880s, Louis Pasteur developed a method of weakening viruses. The weakened viruses could be injected into healthy individuals.
How is this method effective in fighting viral diseases?
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60 sec
B.4.C: Viruses
Q.
Which of these describes a difference between viruses and cells?
