Viruses and Bacteria (Intro)

Which of the following is a true statement about bacteria?

• Bacteria exist in only a few environments on earth

• Bacteria can grow to extremely large sizes

• Most bacteria are harmful to humans

• Bacteria can be both harmful and helpful to humans

Which is usually smaller - bacteria or virus?

• bacteria

• virus

What would happen to a virus if it couldn't find a host cell to invade?

• It wouldn't be able to multiply

• It wouldn't be able to travel through the air

• Its genetic information would wither away

• . It would survive indefinitely

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

What do viruses have in common with your body's cells?

• Their genetic material is surrounded by a nucleus

• They contain many complex organelles

• They contain DNA or RNA

• They are surrounded by capsids

What does a virus do once it's inside one of your cells?

• It stays inside the cell for a while, and then leaves

• It eats up all of the machinery in the cell

• It uses the cell's machinery to make copies of itself

• It prevents the mitochondria from converting glucose to ATP

Reasons that viruses are considered to be nonliving is because

• They are not cellular
• They cannot reproduce on their own
• They  cannot obtain and use energy
• all of the above

What do viruses need to reproduce?

• they need genetic material
• They need a host cell
• They need  bacteria
• They need insulin

A tiny non-living particle that invades and then multiplies inside of a living cell is called a:

• vaccine

• virus

• bacteria

Cell in which a virus reproduces

• endospore
• host cell
• bacteriophage
• plasmid

A virus can multiply only when it is inside a living _____.

• bacteria
• cell
• ribosome
• nucleus