Biogeochemical Cycles

What is nitrogen needed for in our bodies?

• Amino acids and proteins, DNA, and RNA

• Carbohydrates and fats

• Vitamins and minerals

• Water and oxygen

Tags

NGSS.MS-LS1-2

What is phosphorus needed for in our bodies?

• DNA, RNA, ATP, and the phospholipid bilayer

• Sugars and starches

• Hormones and enzymes

• Blood and muscles

Tags

NGSS.MS-LS1-7

Why is gaseous nitrogen in the atmosphere difficult to break down?

• It has a single bond.

• It has a double bond.

• It has a triple bond.

• It has no bond.

What do protists, fungi, and bacteria convert nitrogen gas (N₂) into?

• Oxygen (O₂)

• Ammonia (NH₃)

• Carbon Dioxide (CO₂)

• Water (H₂O)

What enzyme is used to break nitrogen’s triple bond?

• Amylase

• Nitrogenase

• Protease

• Lipase

What does ammonia become when mixed with water?

• Oxygen

• Hydrogen

• Ammonium (NH₄⁺)

• Carbon Dioxide

Tags

NGSS.MS-PS1-2

What do nitrifying bacteria turn ammonia into?

• Oxygen and Hydrogen

• Nitrites (NO₂⁻) and Nitrates (NO₃⁻)

• Carbon Dioxide and Water

• Sugar and Starch

Tags

NGSS.MS-LS2-3

What are two other ways nitrogen can be converted into useful forms?

• By lightning and man-made fertilizer products

• By rain and snow

• By wind and sun

• By clouds and stars

What is denitrification?

• The process of converting nitrate into nitrogen and oxygen.

• The process of converting nitrogen into nitrate.

• The process of converting oxygen into nitrate.

• The process of converting ammonia into nitrite.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

How do humans get nitrogen?

• By drinking water.

• By eating plants.

• By breathing air.

• By swimming in the ocean.