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Twelfth Grade (Grade 12) Chemistry Questions

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Grade 12 Macromolecules
Grade 12 Atomic Structure
How are isotopes of an element different from one another?
  1. they have different numbers of electrons
  2. they have different numbers of protons
  3. they have different numbers of neutrons
  4. they have different numbers of protons and neutrons
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 products in the reaction
Grade 12 Macromolecules
An ATP molecule is made up of                                           .
  1. matrix, inner membrane, outer membrane
  2. NADH, NADPH, FADH
  3. adenine, phosphate groups and ribose
  4. proteins, carbohydrates, and nucleic acids
Grade 12 Macromolecules
Carbohydrates include which of the following?
  1. fructose
  2. starch
  3. polysaccharide
  4. all of the other answers
Grade 12 Macromolecules
Catalase is an enzyme that speeds up which reaction?
  1. breakdown of hydrogen peroxide into oxygen and water
  2. breakdown of lipids in the gut
  3. synthesizing proteins from amino acids
  4. breakdown of lactose in the digestive system
Grade 12 Biochemical Pathways
Which process would require an input of energy?
  1. exergonic reactions
  2. endergonic reactions
  3. hydrolysis
  4. cellular respiration
Grade 12 Macromolecules
Which of the following is most likely an enzyme?
  1. maltose
  2. succrose
  3. lipase
  4. taurine
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
Which of the following 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 assemble polymers, and hydrolysis breaks down polymers.
  4. dehydration releases energy and so does hydrolysis
Grade 12 Macromolecules
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
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 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 Macromolecules
Grade 12 Macromolecules
The function of lipids is                         .
  1. building cell membranes
  2. long term energy
  3. insulation
  4. all of the other answers
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