WorksheetsBiology STAAR Review: Viruses
Total questions: 10
Worksheet time: 5mins
Cold sores are caused by the herpes simplex virus type 1. A company wants to develop antiviral drugs would ask a research immunologist to study-
the mechanism used the virus to infect cells
how closely related the virus is to cold viruses
the metabolism of the virus
meiosis in the virus
A photograph of a virus is shown below. The projection on the surface of this virus allow the virus to-
move inside a host cell
attach to the host cell
control a host cell's DNA
signal other viruses to infect a host cell
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?
They contain antibodies
They reproduce by mitosis
They have identical genomes
They lack membrane-bound organelles
A student states that the capsid has a similar function to the nuclear membrane found in animal cells. Which of these describes the similar functions of capsids and nuclear membranes?
Both transport proteins throughout the structures
Both provide energy for activities in the structures
Both protect genetic information for the structures
Both code for the proteins needed for reproduction
In 1898 Friedrich Loeffler and Paul Frosch found evidence that the cause of the highly contagious hoof-and-mouth disease in livestock was a microscopic infectious particle. It was discovered that this particle requires a host cell to reproduce. Which pathogen is most likely responsible for causing hoof-and-mouth disease in livestock?
A bacterium, because it is contagious
A fungus, because it infects livestock
A protist, because it is microscopic
A virus, because it require a host cell to reproduce
In the 1880s, Louis Pasteur developed a method of weakening viruses. The weakened viruses could injected into healthy individuals. How is this method effective in fighting viral diseases?
The immune system develops antibodies in response the weakened viruses
The weakened viruses attach to unaffected viruses in the host and interrupt the viral reproductive cycle
The rate of genetic mutation in the host is decreased due to the introduction of weakened viruses
Weakened viruses are unable to enter the host organism
Which of these describes the difference between viruses and cells?
Cells contain protein, and viruses contain only carbohydrates
Viruses have flagella, and cells have only cilia
Cells reproduce independently, and viruses require a host to reproduce
Viruses have membranes made of proteins, and cells have membranes made of nucleic acid
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-
an increase in the risk of high blood pressure
an increase in the threat of diseases caused by microorganisms and viruses
a decrease in the flow of blood to vital organs
a decrease in the amount of oxygen being transported to tissues
Viruses can be transmitted though 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-
deactivate the host cell's defenses
synthesize antibodies for defense
metabolize host proteins and grow
access cellular processes for replication
True or false: viruses do NOT contain genetic material
True
False
