Biogeochemical Cycles

Nitrogen is needed for ________, proteins, DNA, and RNA.

• amino acids

• carbohydrates

• lipids

• vitamins

Tags

NGSS.HS-LS1-6

Phosphorus is needed for DNA, RNA, ATP, and the ________ bilayer.

• phospholipid

• carbohydrate

• protein

• nucleotide

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

• Gaseous nitrogen has a triple bond that makes it hard to break apart and use.

• Gaseous nitrogen is highly reactive with most elements.

• Gaseous nitrogen is heavier than oxygen, making it sink to the ground.

• Gaseous nitrogen is easily dissolved in water.

Protists, fungi, and bacteria can convert N2 into ______ (NH3) by using an enzyme called nitrogenase to break nitrogen’s triple bond.

• ammonia

• nitrate

• oxygen

• methane

Tags

NGSS.MS-LS2-3

What enzyme is used by protists, fungi, and bacteria to break nitrogen’s triple bond and convert N2 into ammonia (NH3)?

• Amylase

• Nitrogenase

• Protease

• Lactase

Tags

NGSS.MS-LS2-3

Ammonia becomes ______ (NH4+) when mixed with water, which can be used by plants.

• ammonium

• nitrate

• nitrite

• hydroxide

Tags

NGSS.MS-LS1-5

Nitrifying bacteria can turn ammonia into which of the following for plants to use?

• Nitrites (NO2-) and Nitrates (NO3-)

• Oxygen and Carbon Dioxide

• Glucose and Starch

• Water and Salt

Tags

NGSS.MS-LS2-3

Nitrogen can also be converted into useful forms by _________

• lightning

• photosynthesis

• respiration

• evaporation

Tags

NGSS.MS-LS2-3

Nitrogen can also be converted into useful forms by _________.

• man-made fertilizer products

• photosynthesis in plants

• direct sunlight

• evaporation from oceans

Tags

NGSS.MS-LS2-1

Which of the following is the opposite process of denitrification?

• Nitrogen fixation

• Photosynthesis

• Respiration

• Fermentation