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Ninth Grade (Grade 9) Biochemistry Questions

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Grade 9 Biochemical Pathways
The process yeast carry out that causes bread dough to rise is                         .
  1. alcoholic fermentation
  2. cellular respiration
  3. lactic acid fermentation
  4. aerobic fermentation
Grade 9 Biochemistry
What are the subunits that make up complex carbohydrates?
  1. amino acids
  2. nucleotides
  3. fatty acids
  4. monosaccharides
Grade 9 Biochemistry
Two of the four principle classes of organic compounds are proteins and nucleic acids. What is the relationship between proteins and nucleic acids?
  1. Nucleic acids contain the information to make proteins.
  2. Proteins are long polymers of nucleic acids.
  3. Nucleic acids use proteins for energy.
  4. Nucleic acids are a subset of proteins.
Grade 9 Biochemistry
A florist places a bouquet of white carnations in water containing blue dye. After a time, the flowers turn blue. What process helped the carnations to change color?
  1. Water’s ability to form crystals
  2. Ability of H2O to dissolve NaCl
  3. Cohesion and adhesion of water molecules
  4. Formation of covalent bonds between hydrogen and oxygen molecules
Grade 9 Biochemistry
The picture below shows a group of water skate bugs “walking” on the surface of a pond. When an insect lands or falls into the water, the water molecules vibrate. The water skater uses the resulting vibrations to find its prey. What property of water enables this bug to stay on the surface of the pond and not sink?
  1. Water’s high specific heat enhances the vibrations causing the bugs to float.
  2. An optimum pH of the pond water keeps the water calm so that the bugs don’t sink.
  3. The hydrogen atoms, in the water, bond to the bugs’ legs keeping the bugs on the surface.
  4. Hydrogen bonds provide cohesion of the water molecules enabling the bugs to stay afloat.
Grade 9 Biochemical Pathways
Grade 9 Biochemical Pathways
Which are typically products of cellular respiration?
  1. carbon dioxide and water
  2. oxygen and carbon dioxide
  3. water and glucose
  4. glucose and oxygen
Grade 9 Biochemical Pathways
Which are typically products of photosynthesis?
  1. oxygen and carbon dioxide
  2. glucose and oxygen
  3. carbon dioxide and water
  4. water and glucose
Grade 9 Biochemical Pathways
Which correctly describes the purpose of photosynthesis?
  1. to release energy by decomposing glucose
  2. to store energy in the form of carbon dioxide
  3. to use sunlight energy to make sugars
  4. to create water for hydration
Grade 9 Biochemical Pathways
Which most accurately describes the purpose of cellular respiration?
  1. to decompose glucose into energy that can be used for cellular functions
  2. to decompose usable energy into smaller parts
  3. to decompose different types of substances to be used to construct other parts of the cell
  4. all of the above
Grade 9 Macromolecules
Grade 9 Biochemical Pathways
Grade 9 Macromolecules
Phospholipids are the primary component of
  1. cell membranes.
  2. cell walls.
  3. ribosomes.
  4. steroids.
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