Water's special properties make it the single most important molecule in plant life. Which of the following properties of water enables it to move from the roots to the leaves of plants?

• Water is an excellent solvent.

• Water expands when it freezes.

• 
  Water exhibits cohesive behavior.

• Water is able to moderate temperatures.

How does a property of water aid aquatic organisms in the wintertime?

• Hydrogen bonding causes ice to be less dense thus to float, providing an insulating layer for aquatic organisms.

• Hydrogen bonding causes ice to float, providing additional oxygen for aquatic organisms.

• The low mass of the molecule results in a high specific heat capacity, providing additional oxygen for aquatic organisms.

• The low mass of the molecule results in a high specific heat capacity, providing an insulating layer for aquatic organisms.

Tags

NGSS.HS-ESS2-5

Coastal cities have little variation in temperatures throughout the year. Which property of water is most responsible for this phenomenon?

• density

• boiling point

• melting point

• heat capacity

Tags

NGSS.HS-ESS2-5

Water in the blood helps carry nutrients and gases required for survival throughout the body. Which characteristic of water allows for this action?

• Water has a neutral pH.

• Water maintains temperature.

• Water expands when it freezes.

• Water dissolves many compounds.

Proteins are large macromolecules composed of thousands of subunits. The structure of the protein depends on the sequence of

• lipids

• monosaccharides

• amino acids

• nucleotides

Tags

NGSS.HS-LS1-1

An organic chemist is studying a sample of a macromolecule. The compound has carbon, hydrogen, and oxygen in its structure. The physical properties of the compound show it behaving in a hydrophobic fashion. When placed in a calorimeter, it appears to have a high energy storage capacity. Which of the four types of biological macromolecules was the scientist most likely studying?

• carbohydrates

• lipids

• nucleic acids

• proteins

Which function below is performed by a macromolecule made of nucleotides?

• 
  provide energy

• 
  function as enzymes

• store genetic information

• conduct nervous impulses

A group of scientists is researching a substance that improves the safe transportation of hydrogen when stored in a liquid.

Which of these is the best first step the scientists should perform?

• Research conditions in which hydrogen can be stored in a liquid.

• Conclude which substances allow hydrogen to be stored in a liquid.

• Graph data about conditions that affect the feasibility of storing hydrogen.

• Test the effects different substances have on the feasibility of storing hydrogen. 

Catalase is an enzyme that breaks down hydrogen peroxide (H ₂O ₂) into water and oxygen. A student conducted an investigation to study the effect of catalase concentration. The volume of oxygen released was measured by the amount of water displaced in a graduated cylinder. The table shows the results for five samples.

According to these data, which graph best represents the effect of catalase concentration?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-2

The graph below shows how the activity level of three different enzymes varies with pH.

Based on the information in the graph, what can be determined about the activity of these enzymes?

• Each enzyme is active at a certain pH range.

• Enzyme C is most active in a neutral pH (7).

• Each enzyme will react at all pH levels.

• Enzyme B will react ONLY at pH 7.