Water: Its Importance to Life

What is the molecular formula of water?

• H2O

• H2SO4

• CO2

• O2

Tags

NGSS.HS-ESS2-5

Approximately what percentage of the human body is water?

• 66%

• 80%

• 75%

• 50%

Tags

NGSS.HS-LS1-3

Which property of water contributes to its ability to regulate temperature in organisms?

• High latent heat of evaporation

• Low surface tension

• Low boiling point

• High viscosity

Tags

NGSS.MS-ESS2-4

Water is an excellent solvent due to its:

• Odor and transparency

• Solid state

• Color and taste

• Polarity and high dielectric constant

What is the role of water in the structure of proteins and nucleic acids?

• None of the above

• Prevents them from functioning

• Determines their three-dimensional structures

• Acts as an inert diluent

How does water contribute to the hydration of nucleic acids?

• By dehydrating them

• By maintaining their native conformation

• By converting them into gases

• By breaking their molecular bonds

What is the average time a water molecule exists between gaining or losing a proton at pH 7?

• About an hour

• About a millisecond

• About a second

• About a minute

What happens during hydrogen bonding in water?

• Hydrogen becomes a noble gas

• Hydrogen repels oxygen

• Hydrogen is attracted to two other atoms

• Oxygen forms covalent bonds with carbon

Tags

NGSS.HS-ESS2-5

What is the effect of water's high latent heat of evaporation?

• Causes rapid evaporation

• Gives resistance to dehydration

• Increases water's freezing point

• Decreases water's boiling point

Why is it difficult to obtain really pure water?

• Because it is readily available

• Because it is tasteless

• Because it is colorless

• Due to its solvation properties

Tags

NGSS.HS-ESS2-5