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Twelfth Grade (Grade 12) Biochemical Pathways Questions

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Grade 12 Biochemical Pathways
How do living organisms create macromolecules, organelles, cells, tissues, and complex higher-order structures?
  1. Living organisms create order locally, but the energy transformations generate waste heat that increases the entropy of the universe.
  2. Living things create order using energy from the Sun.
  3. The laws of thermodynamics do not apply to any living things.
  4. Nothing occurs spontaneously.
Grade 12 Biochemical Pathways
Grade 12 Biochemical Pathways
At the end of the mitochondrial electron transport chain, electrons are
  1. donated to NADH to make NAD+.
  2. added to protons and oxygen to make water.
  3. pumped across the membrane to make ATP.
  4. added to ADP to make ATP.
  5. removed from ATP to yield energy.
Grade 12 Biochemical Pathways
Which is an example of anabolism?
  1. homeostasis
  2. hydrolysis
  3. dehydration synthesis
  4. oxidation
Grade 12 Biochemical Pathways
Imagine that, in a closed system, there is an input of 1 kJ of light. The light energy is converted into glucose, then ATP, then into mechanical energy. Which statement about the amount of mechanical energy available is true?
  1. There is 1 kJ of mechanical energy available to do work.
  2. Entropy increases with each conversion, so less than 1 kJ is available.
  3. All the reactions involved are anabolic, so there is only 0.25 kJ of energy available.
  4. All the reactions are endergonic, so no mechanical energy is produced.
Grade 12 Biochemical Pathways
Grade 12 Biochemical Pathways
How does fermentation compensate for the lack of oxygen in terms of electron acceptors?
  1. Fermentation creates an alternative pathway for NADH to be recycled back into NAD+.
  2. Fermentation prevents glucose from being completely oxidized so the number of electrons is limited.
  3. Fermentation creates carbon dioxide to serve as the final electron acceptor during the Kreb's cycle.
  4. Fermentation can oxidize many other substances even without the presence of oxygen.
Grade 12 Biochemical Pathways
Grade 12 Biochemical Pathways
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