Unit 1 - Biochemistry Review

A polar molecule is...

• a molecule with a slight positive charge on one side and a slight negative charge on the other side
• a molecule with no charge
• a molecule with a negative charge on both sides
• a molecule with a positive charge on both sides

What type of macromolecule is this?

• Carbohydrates

• Lipids

• Proteins

• Nucleic Acids

Carbohydrates are important type of biological molecule to carry out life functions. Which is NOT true regarding carbohydrates?

• Monomers are sugars like glucose

• Carbohydrates are made up of carbon, hydrogen, and oxygen atoms.
• Living things store extra sugars as these complex molecules

• Carbohydrates are the main substance that makes up biological membranes

Which is not a major role of lipids in living organisms?

• Cell structure
• Hormone production
• Carry genetic material

• Enzyme activity

In sulfur dioxide, the sulfur side of the molecule holds a slightly negative charge and the hydrogen side is positively charged. This type of bond is called...

• Polar bond

• Nonpolar covalent bond
• Hydrogen bond
• Ionic bond

What happens when water freezes?

• Water changes from a liquid to a gas state, evaporating.
• The bonds of the water molecules weaken

• Water adheres to the surface it freezes on

• The space between the molecules expand

What type of bonds exists between water molecules?

• Ionic bonds
• Hydrogen bonds
• Covalent bonds
• Metallic bonds

The property of water known as cohesion is...

• Water molecules being attracted to each other due to hydrogen bonding
• Water molecules being attracted to oil molecules
• Water molecules repelling each other
• Water molecules having no interaction with each other

What would happen if an enzyme leaves it's preferred pH range?

• The enzyme will become more efficient

  (More Active)

• The enzyme will increase its substrate specificity
• The enzyme may denature and lose its catalytic activity. (Inactive)

• The enzyme will change its shape

A macromolecule is made up of carbon, hydrogen, and oxygen in a ratio of 1 carbon atom to 2 hydrogen atoms (1:2), what is the macromolecule?

• Lipids

• Carbohydrates

• Nucleic Acids

• Proteins