Environmental Science - Chapter 3

Proteins, nucleic acids, carbohydrates, and lipids are all examples of

• atoms.

• inorganic compounds.

• macromolecules.

• elements.

Answer explanation

Macromolecules are the BIG molecules needed for different processes in the body.

The basic unit of matter is

• an element.

• an atom.

• a molecule.

• a macromolecule.

Answer explanation

Atoms are the basic building blocks of life. They make up elements.

The measure of acidity or alkalinity (basicity) of a solution is known as

• pH.

• pOH.

• titration.

• compound.

Answer explanation

pH is a scale that measures how acidic or basic something is; below 7 is an acid (more H+), above 7 is a base (less H+), and neutral is 7 (equal H+).

Out of all of the elements on the periodic table, how many are naturally occurring?

• 20

• 114

• 10

• 92

All of the following are part of a carbohydrate EXCEPT

• carbon.

• hydrogen.

• phosphorus.

• oxygen.

Answer explanation

Carbohydrates are macromolecules that contain carbon, hydrogen, and oxygen.

A substance is considered an acid if its pH is

• equal to 7.

• above 7.

• below 7.

• equal to 14.

Answer explanation

Acids have a pH below 7.

Which of the following is an example of an inorganic compound?

• methane

• glucose

• DNA

• salt

Answer explanation

Inorganic compounds do not contain Carbon - Carbon bonds. Salt is NaCl. Methane is CH₄ (organic). Glucose is C₆H₁₂O₆ (organic). DNA is deoxyribonucleic acid (organic).

Water is not required by all living things for survival.

• True

• False

Answer explanation

Water is required by all living things for survival.

Acids have __________________ concentrations of H+. Bases have _________________ concentrations of H+.

• High; Low

• High; High

• Low; High

• Low; Low

Answer explanation

Acids have high H+ concentrations. Bases have low H+ concentrations.

The return of water from the atmosphere to Earth’s surface in the form of rain, snow, sleet, or hail

• evaporation.

• transpiration.

• precipitation.

• condensation.

Answer explanation

After condensation, water will precipitate to the ground in the form of rain, snow, sleet, or hail.

Tags

NGSS.MS-ESS2-4

NGSS.MS-ESS2-6