Virus Review

Why aren't viruses considered living things?

• They aren't made of cells

• They don't have DNA or RNA

• They make us sick

• They are made of protein

Answer explanation

VIruses are made of a protein capsule containing DNA or RNA.

All living things are made of cells.

Match the following pictures to their names:

• Prokaryotic Cell

• 
• Bacteriophage virus

• 
• Eukaryotic Cell

• 
• Flu virus

• 

Tags

NGSS.MS-LS1-2

What do bacteriophages infect?

• Plants

• Bacteria

• Animals

• Humans

Answer explanation

VIruses are specialized for which cells they infect. The bacteriophages can only infect bacteria, so they can't make us sick!

Viruses can only reproduce with the help of a ​ (a)   cell. This is another reason that viruses are not considered ​ (b)   things.

• host
• living
• dead

How can vaccines prevent people from getting sick if they aren't personally vaccinated?

• Herd immunity

• Immunosupression

• Plasmolysis

• Apoptosis

Answer explanation

In herd immunity, when a person is vaccinated they stop the spread of a virus to other people.

Edward Jenner invented the first modern ​ (a)   in 1796. Vaccines are substances that stimulate the production of ​ (b)   and provide immunity against a ​ (c)   .

• vaccine
• antibodies
• disease
• cell

When a virus takes over a cell, it can cause the cell to create many more copies of the virus until the cell bursts open and releases them. What part of the virus's lifecycle is this?

• Lytic

• Lysogenic

Answer explanation

THe lysogenic cycle is a dormant cycle for the virus - it integrates its DNA into the cell but doesn't not activly take over.

Unlike ​ (a)   , viruses cannot reproduce on their own. Viruses need a ​ (b)   cell to reproduce.

• cells
• host
• virus
• water

Match the following viruses to their hosts:

• Ranavirus

• Humans

• Bacteriophage

• Amphibians

• Tobacco Mosaic Virus

• Plants

• Influenza

• Bacteria

Answer explanation

Viruses are specialized to their hosts. Ranavirus can infect frogs and reptiles, but it cannot affect us.

If someone is sick with a bacterial infection, they may be given ​ (a)   . That doesn't work if you are sick with a ​ (b)   , because viruses are not alive.

• antibiotics
• virus
• cell
• water