Chemistry of Life L2

The chemical formula for _ is H₂O. The H stands for hydrogen and the _ stands for oxygen.

• water / 0

• water / O

If you don't get enough water, you might _.

• get thirsty

• hydrate

• dehydrate

The matter that you encounter every day, both living and nonliving, is made up of basic particles called _.

• neutrons

• protons

• elements

• atoms

There are nearly one hundred types of atoms that occur naturally on Earth. These are known as _.

• particles

• molecules

• elements

Which element makes up most of the human body?

• hydrogen

• carbon

• nitrogen

• oxygen

Cells and the materials in cells are made up of _.

• elements

• oxygen

• atoms

• molecules

A _ is s group of atoms that are held together by chemical bonds.

• compound

• molecule

A substance made up of atoms of two or more elements joined by chemical bonds is called a _.

• molecule

• compound

Organisms use nutrients such as _, _, and _ for energy and as building materials. (Choose 3.)

• enzymes

• lipids

• sugar

• proteins

• carbohydrates

_ are molecules that contain instructions for cell functions.

• Lipids

• Carbohydrates

• Nucleic acids

• Amino acids