Ch 2 Chemistry of Life

Question 1

Iodine and iron are essential to life, but are only found in small quantities in living things. They are examples of

Accepted Answer

trace elements

Question 2

The nucleus is composed of:

Accepted Answer

protons and neutrons

Question 3

All of the chemical reactions that occur within an organism are is referred to as

Accepted Answer

Metabolism

Question 4

A(n) _________ bond involves the transfer of electrons.

Accepted Answer

ionic

Question 5

Water molecules are ________, meaning they have an unequal distribution of charge.

Accepted Answer

polar

Question 6

A substance that is composed of 2 or more different elements that are chemically combined is called a:

Accepted Answer

Compound

Question 7

Which of the following pairs is unrelated?

Accepted Answer

starch-enzyme

Question 8

Fats and steroids are classified as __________ because they are hydrophobic.

Accepted Answer

lipids

Question 9

Amino acids link together with a peptide bond, forming

Accepted Answer

Polypeptide chains

Question 10

What does an enzyme do for a chemical reaction?

Accepted Answer

Speeds it up

Question 11

Which type of macromolecule has the function of storing and transmitting hereditary or genetic information?

Accepted Answer

Nucleic acid

Question 12

A substance that cannot be broken down into simpler substances is a(n)

Accepted Answer

Element

Question 13

What are the basic building blocks of all matter?

Accepted Answer

Atoms

Question 14

Isotopes are atoms of the same element with differing numbers of

Accepted Answer

Neutrons

Question 15

A(n) _________ bond involves the sharing of electrons.

Accepted Answer

Covalent

Question 16

The building blocks of proteins are:

Accepted Answer

amino acids

Question 17

The simplest type of carbohydrate is known as a:

Accepted Answer

monosaccharide

Question 18

An atom of fluorine has nine protons. If it has no charge, it should have _________.

Accepted Answer

9 Electrons

Question 19

What type of ion forms when an atom loses electrons?

Accepted Answer

positive

Questions 19