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Twelfth Grade (Grade 12) Biochemistry Questions

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Grade 12 Macromolecules
The part of an enzyme that substrate molecules fit into is the
  1. enzyme.
  2. substrate.
  3. product.
  4. active site.
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 Macromolecules
Which enzyme is missing if a person cannot digest lactose?
  1. sucrase
  2. glucase
  3. lactase
  4. protease
  5. trypsin
Grade 12 Macromolecules
Which molecule is a helper protein?
  1. substrate
  2. enzyme
  3. active site
  4. product
Grade 12 Macromolecules
Which four elements make up approximately 96% of living matter?
  1. C, H, O, and N
  2. C, H, O, and P
  3. C, O, P, and N
  4. H, N, O, and P
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 Macromolecules

This question is a part of a group with common instructions. View group »

Which structure of a protein consists of a linear sequence of amino acids?
  1. primary
  2. secondary
  3. tertiary
  4. quarternary
Grade 12 Macromolecules

This question is a part of a group with common instructions. View group »

How does the tertiary structure of a protein differ from the secondary structure?
  1. The tertiary structure has a 3D shape, while the secondary structure is often folded or pleated.
  2. The tertiary structure is made of two or more polypeptides, while the secondary structure is made form only one polypeptide.
  3. The tertiary structure is pleated into an alpha helix, while the secondary structure is completely linear.
  4. The tertiary structure is a sequence of amino acids, while the secondary structure contains several polypeptides.
Grade 12 Macromolecules

This question is a part of a group with common instructions. View group »

Which of these describes the quarternary protein structure?
  1. coiled regions folded into a 3-D shape
  2. two or more polypeptides bound to each other
  3. a linear sequence of amino acids
  4. sequences of amino acids bonded with hydrogen bonds
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
Grade 12 Biochemical Pathways
Which term means the building of molecules?
  1. synthesis
  2. digestion
Grade 12 Macromolecules
Which functional group is represented by the structure?
Structural Formula - Amine
  1. carboxyl
  2. amino
  3. phosphate
  4. methyl
Grade 12 Macromolecules

This question is a part of a group with common instructions. View group »

Which protein structure gives the protein its actual function?
  1. primary
  2. secondary
  3. tertiary
  4. quarternary
Grade 12 Macromolecules
All organisms "pay their energy bill" using this substance.
  1. money
  2. cells
  3. protein
  4. ATP
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