Biology Chemistry of Life

The smallest basic unit of matter is the

• molecule.
• atom.
• compound.
• cell.

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Which of the following is formed when an atom gains or loses electrons?

• element
• compound
• molecule
• ion

Atoms in molecules share pairs of electrons when they make

• covalent bonds.
• ionic bonds.
• hydrogen bonds.
• polymers.

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What gives water many properties that are important to living things?

• temperature
• hydrogen bonds
• density
• specific heat

Which of the following solutions has the highest H ion concentration?

• a solution with a pH of 1
• a solution with a pH of 4
• a solution with a pH of 7
• a solution with a pH of 10

What is unique about carbon?

• bonding properties
• ability to bond with oxygen
• properties as a reactant
• properties as an enzyme

Which substance represented in Figure 2.1 (A or B) is the solvent?

• both A and B
• substance A
• substance B
• neither A nor B

The four main types of carbon-based molecules in organisms are carbohydrates, lipids, nucleic acids, and

• starches.
• fatty acids.
• monosaccharides.
• proteins.

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Both animal fats and plant oils are made up of glycerol and

• phospholipids.
• fatty acids.
• polar molecules.
• saturated fats.

Substances are changed into different substances when bonds break and form during

• chemical equilibrium.
• chemical reactions.
• ion formation.
• hydrogen bonding.

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