Viruses

A tiny, non-living particle that invades and replicates inside a host cell is called a/an

• bacterium.

• virus.

• protist.

• fungus.

Viruses contain which substances?

• genetic material (DNA or RNA) and a capsid

• a nucleus, genetic material (DNA or RNA), and a capsid

• a nucleus, genetic material (DNA or RNA), a capsid, and ribosomes

• a nucleus, ribosomes, a capsid, and a plasma membrane

The outer protein layer that surrounds the genetic material of a virus is called a/an

• prion.

• endospore.

• plasma membrane.

• capsid.

Which describes most types of viruses?

• a small, solid ball of infectious protein

• genetic material wrapped in a protein coat

• a primitive type of bacteria

• the smallest type of living cell

Which of the following diseases are caused by a virus?

• Strep throat

• Tooth decay

• HIV/AIDS

• Staph infection

Which is a stage of the lytic cycle?

• adaptation of a virus to infect living organisms

• virus attaches to a host cell using a capsule

• replication of the viral DNA inside the cell's mitochondria

• viral genetic material injected into the cell and used to make more viruses

Which viral reproductive cycle has a dormant period?

• the lytic cycle

• the lysogenic cycle

A virus that infects bacteria is called a/an

• retrovirus.

• prion.

• bacteriophage.

• capsid.

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. This information suggests that the reproductive cycle of the SARS virus is

• lysogenic, because the virus is a coronavirus.

• lytic, because the virus causes respiratory illness.

• lysogenic, because the virus primarily affects older people.

• lytic, because of the quick onset of symptoms after infection.

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 oxygen being transported to tissues.