Amoeba Sisters- Carbon & Nitrogen Cycles

1. What are organic molecules?

• a. molecules that contain nitrogen

• b. molecules that contain oxygen

• c. molecules that contain carbon

2. Which of the following is not true of carbon?

• a. it is found in everything on Earth

• b. it has the ability to form many compounds

• c. it is often known as the building block of life

3. Where does carbon cycle?

• a. between the atmosphere and space

• b. between carbon reservoirs

• c. between carbon pools

4. How do plants typically obtain carbon?

• a. from the atmosphere

• b. from the soil

• c. from rainwater

5. 5. How do animals obtain carbon?

• a. breathing it in from the atmosphere

• b. drinking it in from lakes and rivers

• c. eating plants or other animals

6. 6. What is created when dead organisms are stored in sediment over a very long period of time?

• a. fossils

• b. fossil fuels

• c. mountains

7. 7. Carbon dioxide is a greenhouse gas. How do greenhouse gases impact the atmosphere?

• a. they trap heat in the atmosphere

• b. they keep heat out of the atmosphere

• c. they replace the oxygen in the atmosphere

8. In which biomolecules are nitrogen found?

• a. proteins and lipids

• b. nucleic acids and carbohydrates

• c. proteins and nucleic acids 

9. When nitrogen is converted into useable forms it is….

• a. broken

• b. fixed

• c. able to perform photosynthesis

10. What do nitrogen-fixing bacteria in the soil convert

nitrogen into?

• a. ammonia and ammonium

• b. nitrite and nitrate

• c. nitrous oxide and nitrogen gas