Chapter (2) Chemistry of Life

What is the smallest basic unit of matter?

• Atom

• Element

• Compound

• Molecule

Which of the following is an example of a compound?

• Hydrogen atom (H)

• Oxygen atom (O)

• Water (H2O)

• Carbon dioxide (CO2)

What is an ion?

• An atom that has gained or lost one or more electrons

• An atom that has gained or lost protons

• An atom that has gained or lost neutrons

• An atom that has gained or lost energy levels

How do atoms share electrons in covalent bonds?

• By gaining or losing electrons

• By transferring electrons

• By sharing a pair of electrons

• By forming ionic bonds

What is the role of hydrogen bonds in water?

• To break down water molecules

• To form covalent bonds

• To provide energy for cells

• To create cohesion and adhesion

What is a solution?

• A compound made of atoms of different elements bonded together

• A polar molecule with charged regions

• A homogeneous mixture formed when one substance dissolves in another

• A nonpolar molecule without charged regions

What is the pH range of an acid?

• Less than 7

• Equal to 7

• Greater than 7

• Depends on the specific acid

Which type of carbon-based molecule is made of monomers and polymers?

• Carbohydrates

• Lipids

• Proteins

• Nucleic acids

What is the function of lipids?

• To provide energy for cells

• To make up cell membranes

• To build proteins

• To store genetic information

What are proteins made of?

• Amino acids

• Nucleotides

• Fatty acids

• Monosaccharides