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Ninth Grade (Grade 9) Macromolecules Questions

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Grade 9 Macromolecules
Which macromolecule contains carbon, hydrogen, and oxygen in a 1:2:1 ratio?
  1. carbohydrates
  2. proteins
  3. lipids
  4. nucleic acids
Grade 9 Macromolecules
The speed of reactions can be affected by
  1. enzymes.
  2. temperature.
  3. concentration of reactants.
  4. all of the above.
Grade 9 Macromolecules
Hormones such as testosterone and adrenaline are included in what group of organic molecules?
  1. amino acids
  2. carbohydrates
  3. lipids
  4. nucleic acids
  5. proteins
Grade 9 Macromolecules
A macromolecule that forms when molecules called nucleotides join together in a long chain is a
  1. protein.
  2. nucleic acid.
  3. carbohydrate.
  4. lipid.
Grade 9 Macromolecules
Which statement describes a function of carbohydrates?
  1. They provide insulation.
  2. They provide cushioning.
  3. They control metabolism.
  4. They allow for movement.
  5. They serve as a main energy source.
Grade 9 Macromolecules
How can enzymes affect chemical reactions in living systems?
  1. They can provide the substrate needed for the reaction to be carried out.
  2. They can affect reaction rates.
  3. They can absorb water during the formation of polymers.
  4. They can combine with water to produce gaseous wastes.
Grade 9 Macromolecules
Fats, oils, and waxes belong to the group of organic compounds called
  1. enzymes.
  2. starches.
  3. proteins.
  4. lipids.
Grade 9 Macromolecules
A substrate binds to an enzyme at the
  1. active site.
  2. cell membrane.
  3. chemical reaction site.
Grade 9 Macromolecules
Ruffnut and Tuffnut made fish sandwiches to eat for lunch. What two macromolecules did they eat the most of during lunch?
  1. carbohydrates and proteins
  2. carbohydrates and lipids
  3. lipids and proteins
  4. proteins and fatty acids
Grade 9 Macromolecules
What organic monomer serves as a building block to proteins?
  1. hormone
  2. glucagon
  3. amino acid
  4. insulin
Grade 9 Macromolecules
All amino acids include an acidic                 group.
  1. acetate
  2. carboxyl
  3. phenol
  4. methyl
Grade 9 Macromolecules
Which of these macromolecules is primarily used as a quick source of energy?
  1. carbohydrates
  2. lipids
  3. proteins
  4. nucleic acids
Grade 9 Macromolecules
Triglycerides are lipids that are composed of
  1. three glycerols and one fatty acid.
  2. three fatty acids and one glycerol.
  3. a carboxyl and two glycerols.
  4. an amine and a carboxyl.
Grade 9 Macromolecules
Although carbohydrates and lipids have different functions, the same elements are present in both. Which elements are found in both carbohydrates and lipids?
  1. carbon, nitrogen, and oxygen
  2. carbon, hydrogen, and oxygen
  3. carbon, nitrogen, hydrogen, and oxygen
  4. nitrogen, hydrogen, and oxygen
Grade 9 Macromolecules
Phospholipids have hydrophobic heads and hydrophilic tails. What does this indicate about the phospholipid structure?
  1. Phospholipids are ionic.
  2. Phospholipids contain three fatty acids.
  3. The heads are polar, and the tails are nonpolar.
  4. The heads are nonpolar, and the tails are polar.
Grade 9 Macromolecules
Food serves as the main source of nucleic acids.
  1. True
  2. False
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