BIO 243 Lab Homework Chapter 2

Which subatomic particles are found in the nucleus of the atom?

• Electrons and neutrons

• Protons and electrons

• Electrons and ions

• Protons and neutrons

Answer explanation

Protons (which have a positive charge) and neutrons (which are neutral/have no charge) are found in the nucleus of the atom.

The number of protons in an atom is known as the atom's __________.

• atomic weight

• atomic number

• mass number

• nuclear number

Atoms that are of the same element but contain different numbers of neutrons are called

• isotopes

• cations.

• isomers.

• anions.

• None of these are correct.

Ions with a negative charge are called

• polyatomic ions.

• anions.

• radicals.

• cations.

• None of these are correct.

Which type of reaction is depicted here?

• Decomposition

• Synthesis

• Reversible

• Exchange

Answer explanation

Decomposition reactions break molecules into smaller fragments.

The energy of motion is called what?

• hydrolysis

• anabolism

• potential energy

• kinetic energy

Chemical reactions that release energy are categorized as ________.

• hydrolytic

• endergonic

• catabolic

• anabolic

• exergonic

Which of the following molecules are considered inorganic?

• Lipids

• DNA

• Water

• Proteins

The most acidic solution would have a pH of ________.

• 14

• 7

• 0

• 10

• 4

Which of the following is an example of a disaccharide?

• cellulose

• glycogen

• fructose

• starch

• sucrose