Bacteria and Viruses

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

How did bacteria make complex life on Earth possible?

• By releasing oxygen into the atmosphere

• By destroying life-inhibiting volcanoes

• By evolving rapidly into multi-celled organisms

• All of the above

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NGSS.HS-ESS2-7

NGSS.HS-LS2-5

What might happen if you didn't have bacteria in your digestive tract?

• Your intestines would shut down

• Your body couldn't break down certain types of food

• You would never get sick

• You wouldn't be able to eat vegetables

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NGSS.MS-LS1-7

What do all bacteria have in common?

• They all have cell nuclei.

• They're all multi-cellular organisms.

• They're all single-celled organisms.

• They can all be found inside the human body

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NGSS.MS-LS1-1

Name two common shapes of bacteria:

Name two unusual places that bacteria can live:

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

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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

Which of the following is a true statement about viruses?

• They are only spread through person-to-person contact

• They can be spread in a number of different ways

• All of them are harmful to humans

• They can only be spread through exposure to animal waste