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Twelfth Grade (Grade 12) Chemistry Questions

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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 Molecules and Compounds
What can you predict according to VSEPR theory, provided you know the distribution of orbitals containing electronic pairs around the central atom?
  1. shape of the molecule and bond angle
  2. heat of formation of molecule
  3. solvation energy of molecule
  4. lattic energy of molecule
Grade 12 Properties of Matter
Which equation is used in Boyle's Law calculations?
  1. PV=constant
  2. VT=constant
  3. PVT=constant
  4. none of the above
Grade 12 Organic Chemistry
Which of the following is an aliphatic saturated hydrocarbon?
  1. C6H6
  2. C6H10
  3. C6H12
  4. C6H14
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 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 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 Oxidation-Reduction Reactions
Which of the following properties qualitatively describes the ability of an atom to attract electrons?
  1. Ionization potential
  2. Electron affinity
  3. Electronegativity
  4. Valence
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
Which term means the building of molecules?
  1. synthesis
  2. digestion
Grade 12 Organic Chemistry
Which of the following chemical formulas correctly represents a molecule of 1-propyne?
  1. CH3CH2CH3
  2. CHCCH3
  3. CH2CHCH3
  4. CHCH
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