Unit 3 - Earth's Environmental Systems

Front

What is the hydrosphere?

Back

The hydrosphere is the sphere of Earth that contains all of its water, including oceans, rivers, lakes, and groundwater.

Front

What are proteins primarily composed of?

Back

Proteins are mainly composed of carbon, hydrogen, oxygen, and nitrogen.

Front

What is a negative feedback loop?

Back

A negative feedback loop is a process that counteracts changes in a system, helping to maintain stability.

Front

What macromolecule provides structural support in cells?

Back

Carbohydrates provide structural support in cells, such as cellulose in plant cell walls.

Front

Which of the following is NOT a lipid?

Back

Enzymes are not lipids; they are proteins that catalyze biochemical reactions.

Front

What is the biosphere?

Back

The biosphere is the global sum of all ecosystems, where life exists, including land, water, and the atmosphere.

Front

Define the lithosphere.

Back

The lithosphere is the rigid outer layer of the Earth, consisting of the crust and upper mantle.

Front

What role do lipids play in the body?

Back

Lipids serve as energy storage, insulation, and make up cell membranes.

Front

What are nucleic acids?

Back

Nucleic acids, such as DNA and RNA, are macromolecules that store and transmit genetic information.

Front

Explain the term 'ecosystem'.

Back

An ecosystem is a community of living organisms interacting with their physical environment.