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- 1. Multiple Choice
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
- 2. Multiple Choice
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
- 3. Multiple Choice
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
- 4. Multiple Choice
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
- 5. Multiple Choice
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
- 6. Multiple Choice
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
- 7. Multiple Choice
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
- 8. Multiple Choice
What term best describes the function of flagella in bacteria?
locomotion
digestion
absorption
reproduction
- 9. Multiple Choice
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
- 10. Multiple Choice
Which of the following depicts (shows) one of the most common forms of bacteria?
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