Chapter 2 quiz Chemistry of the living things

Molecules that contain carbon, hydrogen, and oxygen are known as (a)   .

Molecules known as (a)   are the building blocks of protein.

The smallest particles of elements that enter into chemical reactions are (a)   .

The number of protons in an atom is equal to the number of (a)   .

The number of elements found naturally in our world is _____.

• 80

• 118

• 92

• 132

The smallest unit of a compound is a (a)   .

A positively or negatively charged particle is called a/an (a)   .

The four groups of organic compounds are _____, _____, _____, and _____.

(a)  

(a)   is involved in the process of heredity.

A chemical reaction in the cell is affected by?

(a)