Chemistry of Life

8. Some insects can stand on the surface of water because water

• is a good evaporative coolant
• is cohesive and adhesive
• has a high specific heat
• has a high boiling point

14. Three amino acids linked by peptide bonds form how many water molecules?

• one
• two
• three
• four

5. A monosaccharide is a

• carbohydrate
• lipid
• nucleic acid
• protein

15. Which of the following pairs is unrelated?

• sugar-carbohydrate
• fat-lipid
• amino acid-protein
• starch-fatty acid

12. What is the function of enzymes in biological systems?

• Enzymes act as catalysts to drive chemical reactions forward
• Enzymes act as substrates when the necessary proteins are unavailable
• Enzymes bond with substrates to create the new reaction products
• Enzymes act as products to create new chemical reactions

7. Ice floats on a lake. This characteristic of water is responsible for

• preventing a lake from freezing solid
• altering migration patterns of fish
• mixing a lake's thermal layers
• suffocation of aquatic organisms

1. The space surrounding the nucleus of an atom contains

• protons
• electrons
• neutrons
• ions

4. The most abundant compound in most living things is

• carbon dioxide
• water
• sodium chloride
• sugar

9. Which of the following macromolecules are a prominent part of animal tissues that function in insulation, helping animals conserve heat?

• Lipids
• Nucleic acids
• Proteins
• Carbohydrates

10. Both lipids and carbohydrates are important in animal cells because both

• provide insulation
• contain nitrogen
• store energy
• form cell walls