The Chemistry of Life Test

In a water molecule, hydrogen and oxygen share electrons to form a bond. Those shared electrons spend more time around the oxygen atom than the hydrogen atoms. As a result, the oxygen atom is

• very negative

• slightly negative

• very positive

• slightly positive

Tags

NGSS.MS-PS1-1

Which of the following properties of water can BEST explain how water molecules stick to the sides of a graduated cylinder?

• surface tension

• expansion

• adhesion

• cohesion

Which of the following properties of water can BEST explain how the basilisk lizard can "walk" on water without sinking?

• heat capacity

• expansion

• adhesion

• cohesion

Which statement best explains why water is the most important substance for sustaining life on Earth?

• Water insulates Earth from the cold temperatures of outer space

• Water moderates Earth's climate by absorbing large amounts of heat

• Water builds organic molecules out of its living parts

• Water contains stored energy that powers chemical reactions

Tags

NGSS.HS-ESS2-5

In places that get very little rainfall, such as the desert in Arizona, outdoor temperature vary greatly. Daytime temperatures get very high and nighttime temperatures can get very low; the temperature often drops dramatically as soon as the sun sets. How would temperature be different if there were a large body of water nearby?

• It would be cooler during the day and warmer at night

• It would be very hot in the day and even colder at night

• It would be cooler in the day but still cold at night

• It would be warmer in the day and warmer at night

Tags

NGSS.HS-ESS2-4

NGSS.HS-ESS2-5

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

• Water expands when it freezes

• Water dissolves many compounds

• Water has a neutral pH

• Water maintains temperature

Water is essential for life. Its special properties make water the most important molecule in plant life. Which of the following properties of water allows it to move from the roots to the leaves of a plant?

• Water exhibits cohesive behavior

• Water is able to moderate temperature

• Water expands as it freezes

• Water is an excellent solvent

Under normal conditions, human body temperature is about 37 degrees Celsius. Which statement explains one reason why body temperature is maintained even when air temperature is warmer?

• water has a high heat capacity

• water is more dense when it is warmer

• Water is an acid

• Water is a versatile solvent

Tags

NGSS.HS-LS1-3

Biological macromolecules are organic compounds. Which three elements are found in these organic compounds?

• Nitrogen, chlorine, and phosphorus

• Nitrogen, hydrogen and oxygen

• Carbon, hydrogen, and oxygen

• Carbon, hydrogen and neon

Tags

NGSS.HS-LS1-1

NGSS.HS-LS1-6

Which of the following statements about macromolecules is correct?

• Nucleic acids often act as catalysts in biochemical reactions.

• Proteins are used in cellular respiration to produce cellular energy.

• Lipids are nonpolar, used for long term energy storage, and are commonly found in cell membranes.

• Carbohydrates can store genetic information and are found in the cell nucleus.