Biochemistry

Which of the following properties of water enables molecules to cling together as they move from the roots to the leaves of plants?

• Water expands as it freezes.
• Water is an excellent solvent.
• Water exhibits cohesive behavior.
• Water moderates temperature.

Large bodies of water do not quickly fluctuate, or change, in temperature. Why?

• Water is a solvent.
• Water has a high heat capacity.
• Water acts as a buffer.
• Water is non-polar.

Tags

NGSS.HS-ESS2-5

NGSS.HS-PS3-4

What two elements make up water?

• Helium and oxygen
• Hydrogen and oxygen
• Helium and carbon
• Oxygen and carbon

Tags

NGSS.MS-PS1-1

What term describes when water is attracted to other substances?

• Cohesion
• Adhesion
• Capillary Action
• Surface Tension

Why can water have no net charge but have slight charges in different parts of the molecule?

• The oxygen end is slightly negative and the hydrogen end is slightly positive.
• The hydrogen end is slightly negative and the oxygen end is slightly positive.
• The hydrogen and oxygen ends change in polarity.
• Because it is hydrophobic.

Tags

NGSS.HS-PS1-3

Why does ice float?

• As water freezes, it expands and its density decreases.
• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
• As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
• As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

Proteins are polymers formed from 

• lipids.
• carbohydrates.
• amino acids.
• nucleic acids.

Tags

NGSS.HS-LS1-1

DNA is a polymer formed from 

• fatty acids. 
• monosaccharides.
• amino acids.
• nucleotides.

Tags

NGSS.HS-LS1-1

A compound is a substance which contains .......

• only one type of atom
• only two types of atom
• two or more chemicals which can be easily separated
• two or more elements chemically joined together

Which is a Carbohydrate's monomer?

• Sugar
• Amino acids
• Monosacharide
• Nucleotide

Tags

NGSS.MS-LS1-7