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Twelfth Grade (Grade 12) Biochemical Pathways Questions

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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 Biochemical Pathways
Photosynthesis occurs in the chloroplasts of
  1. ants.
  2. plants.
  3. grasshoppers.
  4. chickens.
Grade 12 Biochemical Pathways
Which mineral is a component of both proteins and nucleic acids?
  1. magnesium
  2. iron
  3. potassium
  4. nitrogen
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 Biochemical Pathways
Photosynthesis occurs in the chloroplasts of                .
  1. ants
  2. plants
  3. grasshoppers
  4. chickens
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 Biochemical Pathways
All of the physical and chemical changes that occur in an organism is                .
  1. metabolism
  2. catabolism
  3. homeostasis
  4. assimilation
Grade 12 Biochemical Pathways
Hydrolysis is a reaction in which
  1. water is added to a polymer and it breaks the polymer down.
  2. water is used to build polymers from monomers.
  3. proteins are made using water.
  4. water is taken away from a monomer.
Grade 12 Biochemical Pathways
Which action is common to both fermentation and aerobic cellular respiration?
  1. Oxygen is consumed.
  2. FADH2 is produced.
  3. ATP is synthesized.
  4. Carbon dioxide is consumed.
Grade 12 Biochemical Pathways
Which process requires an input of energy?
  1. exergonic reactions
  2. endergonic reactions
  3. hydrolysis
  4. cellular respiration
Grade 12 Biochemical Pathways
Which statement is a true distinction between cellular respiration and fermentation?
  1. NADH is oxidized by the electron transport chain in cellular respiration only.
  2. Fermentation is an example of an endergonic reaction, while cellular respiration is an exergonic reaction.
  3. Substrate-level phosphorylation is unique to fermentation only.
  4. Fermentation is the metabolic pathway of prokaryotes, whereas cellular respiration is used only by eukaryotes.
Grade 12 Biochemical Pathways
A plant makes food through photosynthesis and is then eaten by a deer. The deer uses the sugars from the plant to make energy for itself when it runs away from a wolf. Which pathway represents how energy is transformed in this scenario?
  1. light --> chemical --> mechanical
  2. chemical --> kinetic --> heat
  3. heat --> potential --> chemical
  4. mechanical --> heat --> potential
Grade 12 Biochemical Pathways
What term describes the collective sum of all the chemical reactions within a living structure?
  1. energetics
  2. activity
  3. metabolism
  4. entropy
Grade 12 Biochemical Pathways
Which statement best summarizes the relationship between dehydration reactions and hydrolysis?
  1. Dehydration assembles, and hydrolysis breaks down.
  2. Dehydration reactions can occur only after hydrolysis.
  3. Dehydration reactions add water to form polymers, and hydrolysis adds water to break down polymers.
  4. Dehydration reactions release energy, and so does hydrolysis.
Grade 12 Biochemical Pathways
The pigment chlorophyll mostly absorbs
  1. moonlight.
  2. red and blue light.
  3. green light.
  4. all visible light.
Grade 12 Biochemical Pathways
Examples of an exergonic (catabolic) reaction include the formation of                                                 .
  1. maltose from glucose
  2. fatty acids and glycerol from lipids
  3. ATP and water from ADP and inorganic phosphate
  4. glucose and oxygen from carbon dioxide and water
Grade 12 Biochemical Pathways
In photosynthesis, water undergoes                     , while carbon dioxide undergoes                     .
  1. oxidation; reduction
  2. reduction; oxidation
  3. no change; oxidation
  4. none of the above
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