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Ninth Grade (Grade 9) Biochemistry Questions

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Grade 9 Biochemical Pathways
What is the chemical equation for photosynthesis?
  1. 5CO+7H2O→C6H12O6+6O2
  2. 6CO2+6H2O→C6H12O6+6O2
  3. 4CO2+7H2O→C6H12O5+4O2
Grade 9 Macromolecules
Which statement describes the function of enzymes?
  1. They serve as biological impediments.
  2. They serve as catalysts in reactions.
  3. They serve as biological reactants.
  4. All of the above
Grade 9 Macromolecules
Which is NOT an example of a protein?
  1. enzyme
  2. hormone
  3. collagen
  4. fruit
Grade 9 Biochemical Pathways
Which process is the second stage of cell respiration?
  1. Calvin cycle
  2. Krebs cycle
  3. glycolysis
  4. electron transport chain
Grade 9 Macromolecules
The secondary structure of a protein involves
  1. a chain of amino acids.
  2. alpha-helices and beta-pleated sheets.
  3. three-dimensional folding.
  4. multiple chains of amino acids.
Grade 9 Biochemistry
Phospholipids are linear molecules with one polar end and one nonpolar end. How does this structure relate to their function in cell membranes?
  1. The polar tails of phospholipids form the inside of the cell membrane.
  2. The nonpolar heads of phospholipids form the outside of the cell membrane.
  3. The polar heads of phospholipids combine to form the middle of the cell membrane, with the tails on the outside.
  4. The nonpolar tails of phospholipids combine to form the middle of the cell membrane, with the heads on the outside.
Grade 9 Macromolecules
What macromolecule contains the code for building proteins?
  1. collagen
  2. DNA
  3. polysaccharide
  4. RNA
Grade 9 Biochemical Pathways
The energy-storing molecules of photosynthesis are
  1. ADP and NADP.
  2. ATP and NADPH.
  3. light and glucose.
  4. carbon dioxide and water.
Grade 9 Macromolecules
Which macromolecule is a short-term energy source?
  1. carbohydrates
  2. lipids
  3. nucleic acids
  4. proteins
Grade 9 Macromolecules
Carbohydrates primarily serve what purpose?
  1. to aid in digestion
  2. to break down molecules
  3. to regulate the flow of acid
  4. to supply the body with energy
Grade 9 Macromolecules
What are the six most frequently found atoms in living things?
  1. oxygen, chlorine, helium, lithium, sulfur, and nitrogen
  2. hydrogen, helium, lithium, benzene, boron, and carbon
  3. carbon, phosphorus, sulfur, oxygen, nitrogen, and hydrogen
  4. magnesium, sodium, carbon, oxygen, potassium, and silicon
Grade 9 Macromolecules
Proteins serve in a number of important functions in organisms. (Select all that apply.)
  1. provide a major source of energy
  2. form cellular and tissue structures
  3. transport substances into or out of cells
  4. help to fight disease
Grade 9 Macromolecules
What macromolecule is made up of building blocks of amino acids?
  1. carbohydrate
  2. DNA
  3. lipid
  4. protein
Grade 9 Macromolecules
What makes up the backbone of the DNA chain?
  1. RNA
  2. nucleotides
  3. phosphate groups and sugars
  4. hydrogen bonds and nitrogenous bases
Grade 9 Biochemical Pathways
Cellular respiration begins with a pathway called
  1. glycolysis.
  2. telophase.
  3. the Krebs cycle.
  4. the electron transport chain.
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