Biochem Pre-test

Which macromolecule doesn't dissolve in water?

• Carbs
• Lipids
• Nucleic Acids
• Proteins

Nucleic acids, proteins, and other large biological molecules are known as polymers because...

• they are the base units used in the formation of plastics
• they all function as enzymes
• they contain only ionic bonds
• they contain many small, repeating subunits bonded together

Carbon atoms have four electrons in their outer shell. This means that a single carbon atom can form up to _______ bonds with other atoms.

• 4
• 8
• 6
• 2

Which macromolecule is used for short term energy?

• Proteins
• Carbohydrates
• Nucleic Acids
• Lipids

When electrons are shared between two atoms, the bond formed is

• ionic
• covalent
• hydrogen
• peptide

The number of protons is the same as ..

• the number of neutrons
• the atomic number
• the atomic mass

Attractions between water molecules are called

• Covalent bonds
• Ionic bonds
• Polar bonds
• Hydrogen bonds

If an atom has 5 protons and 4 electrons, what is its charge?

• Neutral
• Positive
• Negative
• Unknown

Which of the following elements make up 96% of living matter?

• H, S, Mg, Zn

• C, H, O, N

• C, P, Si, K

• Ne, H, He, Na

Why do ionic bonds form?

• so the number of protons equals the number of electrons
• to fill the outermost energy level
• so an atom can become unstable