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Twelfth Grade (Grade 12) Biochemistry Questions

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Grade 12 Macromolecules
Are enzymes reusable?
  1. yes
  2. no
  3. sometimes
Grade 12 Macromolecules
What property makes phospholipids the ideal organic molecule to make up the cell membrane?
  1. Phospholipids dissolve easily in water, so materials can pass through them without the need for energy.
  2. Phospholipids contain many mitochondria, so the cell membrane has all the energy it needs to undergo mitosis.
  3. Phospholipids maintain their shape all the time, so organisms made from these cells can grow very large.
  4. Phospholipids have hydrophobic and hydrophilic ends, so cells can live in an aqueous environment and still carry out all their functions.
Grade 12 Macromolecules
The function of lipids is
  1. building cell membranes.
  2. long-term energy storage.
  3. insulation.
  4. all of the above
Grade 12 Biochemical Pathways
Photosynthesis occurs in the chloroplasts of
  1. ants.
  2. plants.
  3. grasshoppers.
  4. chickens.
Grade 12 Macromolecules
Enzymes and some hormones are examples of
  1. proteins.
  2. carbohydrates.
  3. lipids.
  4. nucleic acids.
Grade 12 Macromolecules
All are properties of water except
  1. adhesion.
  2. cohesion.
  3. heat capacity.
  4. enzyme ability.
Grade 12 Macromolecules
How are enzymes denatured?
  1. water
  2. pH
  3. temperature
  4. temperature and pH
Grade 12 Biochemical Pathways
Energy is released from ATP when                             .
  1. a phosphate group is added
  2. amino acids bond to proteins
  3. a phosphate group is removed
  4. it is heated by the Sun
Grade 12 Macromolecules
Carbohydrates include
  1. fructose.
  2. starch.
  3. polysaccharides.
  4. all of the above
Grade 12 Biochemical Pathways
Grade 12 Biochemical Pathways
How do enzymes make reactions go faster?
  1. They lower activation energy.
  2. They raise the activation energy.
  3. They supply extra reactants.
  4. They limit the amount of products in the reaction.
Grade 12 Macromolecules
Grade 12 Biochemical Pathways
Grade 12 Macromolecules
Which organic molecule contains this type of functional group?
Structural Formula - Phosphate
  1. carbohydrate
  2. protein
  3. steroid
  4. nucleic acid
Grade 12 Macromolecules
What does an allosteric inhibitor do?
  1. It changes the shape of the enzyme.
  2. It increases the concentration of the products.
  3. It decreases the concentration of the inactive enzymes.
  4. It changes the shape of the substrate.
Grade 12 Macromolecules
Large biological molecules are synthesized by removing
  1. carbon.
  2. oxygen.
  3. covalent bonds.
  4. peptides.
  5. water.
Grade 12 Biochemical Pathways
What role does oxygen play in cellular respiration?
  1. It is reduced in glycolysis as glucose is oxidized.
  2. It provides electrons to the electron transport chain.
  3. It is required for the production of heat and light.
  4. It serves as the final electron acceptor during the electron transport chain.
Grade 12 Macromolecules
Which is the macromolecule?
  1. oxygen
  2. bacteria
  3. protein
  4. fruit fly
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