DHS_FF_Virues

All living things are part of the cell theory. Why are viruses not included as part of the cell theory?

• They do not contain genetic information
• They are smaller than any living thing
• They are not capable of producing new viruses on their own
• They lack internal structures found in cells, such as nuclei

A virus has a very small structure. Which of the following is part of this viral structure?

• Organelles
• Cell walls
• Host cell 
• Nucleic acid

A doctor gave one of his patients an antibiotic. Which disease was this doctor treating?

• Influenza
• Food poisoning
• Cold
• Chicken pox

The lytic cycle involves several steps. The last step that completes the lytic cycle occurs when ---

• the host cell bursts
• the virus injects its nucleic acid
• new viruses begin to be made
• the viral DNA becomes part of the host cell's DNA

Which of the following happens as part of both the lytic cycle and the lysogenic cycle?

• New viruses are made.
• The host cell dies. 
• The entire virus infects the cell.
• The virus injects its nucleic acid into the host cell. 

Which statement below best summarizes the primary difference between cells and viruses?

• All cells are prokaryotes, while viruses are eukaryotes. 
• All cells are eukaryotes, but viruses are not made of cells. 
• Cells can carry of life functions, but viruses cannot. 
• Viruses can carry out life functions, but bacteria cannot. 

Individuals with HIV sometimes contract pneumonia infections that are rare in the rest of the population because people with HIV ---

• are unable to fight off these pneumonia causing organisms
• are more often exposed to these pneumonia-causing organisms
• release pheromones that attract the pneumonia-causing organisms
• release substances that incease the strength of the pneumonia-causing organisms

How do viruses reproduce?

• They copy their own genetic materials inside a protein coat. 
• They kill a cell and reproduce inside it. 
• They invade a living cell and use the cell's functions to replicate their genetic material. 
• They do not reproduce because they are not technically living things. 

Viruses have structures that allow them to inject their genetic material directly into the DNA of a host cell. This benefits the virus in that ---

• the virus is able to transform into a host cell. 
• mutations are introduced into the virus. 
• the host cell is turned into a virus. 
• the virus uses the host cell to replicate itself. 

A tomato plant in a greenhouse was found to be infected with tobacco mosaic virus. A few weeks later, nearby plants were also found to be infected with the virus. Which of the following best describes how the virus reproduced?

• The virus made its own spores. 
• The virus produced seeds in the tomatoes. 
• The virus used the host plant's resources and machinery to reproduce. 
• The virus immediately killed the host plant and was free to reproduce.