Nitrogen Cycle Quiz

What is the process of releasing ammonia from biological molecules called?

• Nitrogen fixation

• Ammonification

• Denitrification

• Nitrification

Which bacteria are involved in ammonification?

• Lactobacillus spp.

• Streptococcus spp.

• Bacillus spp.

• E. coli

What does a faint yellow color indicate when testing for ammonia?

• No ammonia

• Small amount of ammonia

• Large amount of ammonia

• Deep yellow ammonia

What is the first step in the lab work for ammonification?

• Add Nessler's reagent

• Inoculate peptone broth

• Prepare a Gram stain

• Incubate the tube

What is the main source of nitrogen for living organisms?

• Oxygen

• Hydrogen

• Carbon

• Nitrogen

What happens to nitrogen in the environment?

• It becomes oxygen

• It disappears

• It is stored in plants

• It is constantly turned over

What color indicates a large amount of ammonia?

• Clear

• Brown precipitate

• Deep yellow

• Faint yellow

What is the purpose of the control tube in the experiment?

• To test for ammonia

• To compare with the inoculated tube

• To grow more bacteria

• To store soil samples

What is the result of decomposing dead plants and animals?

• Release of ammonia

• Release of carbon

• Release of nitrogen

• Release of oxygen

What type of bacteria are found in the peptone broth culture?

• Gram-positive

• Gram-negative

• No bacteria

• Both Gram-positive and Gram-negative