Brainpop-Bacteria

What does Tim mean when he says bacteria are the most abundant form of life on earth?

• they're the smallest form of life on earth

• they're the most common form of life on earth

• they're the most diverse form of life on earth

• they're the most specialized form of life on earth

What do all bacteria have in common?

• they all have cell nuclei (a nucleus)

• they're all multi-cellular

• they're all single-celled

• they all can be found inside the human body

How did bacteria make complex life on earth possible?

• by releasing oxygen into the atmosphere

• by destroying volcanoes (volcanoes caused a lot of organisms to die)

• by evolving rapidly (quickly) into multi-celled organisms

• all of the above

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

Nitrogen-fixing bacteria help plants thrive. What do nitrogen-fixing bacteria do?

• absorb harmful nitrogen from the bodies of plants

• absorb nitrogen in the soil before it harms plants

• convert nitrogen in the soil into a form that plants can absorb

• transform nitrogen into carbon dioxide

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

What effect do antibiotics have on bacteria?

• they help bacteria grow in size

• they prevent bacteria from digesting food

• they destroy bacteria

• they help bacteria reproduce

What term best describes the function of flagella in bacteria?

• locomotion

• digestion

• absorption

• reproduction

How are bacterial cells different from plant and animal cells?

• bacterial cells contain many more cell organelles

• bacterial cells contain almost no organelles

• bacterial cells have more complex cell organelles

• bacterial cells have well-defined nuclei

Which of the following depicts (shows) one of the most common forms of bacteria?

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