Microbiome Review

About how many bacteria live in or on a human body? (CHECK ONLY ONE BOX)

• 100
• 1,000
• 100,000
• 100 trillion

Which two things make humans a great place for bacteria to live and grow?

• food and oxygen
• food and space
• food and carbon dioxide
• food and water

Scientists use the word ___________ when they are comparing the sizes of things that are very different. For example, a human, a virus, and a skyscraper are at different ___________s.

• scale
• correlate
• deduce
• infer

Which of the following is the smallest?

• bone cell
• water molecule
• a grain of salt

Which of the following explains why a person with fewer than normal helpful bacteria in their gut can become infected more easily by bad bacteria?

• There is more food and space available to help the harmful bacteria grow.
• There is less food and space available to help the harmful bacteria grow.
• There is more food, but less space available to help the harmful bacteria grow.
• There is less food, but more space available to help the harmful bacteria grow.

________ are the tiny structures that make up all living things on Earth and they are the smallest units that are able to perform life functions such as growing and reproducing.

• cells
• lymph nodes
• tissues
• nerves

Which of the following is a microorganism?

• beetle
• ladybug
• earthworm
• bacteria

Which of the following words means all the microorganisms that live in a particular environment, such as the gut of a human.

• microsystem
• microhabitat
• microsphere
• microbiome