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Ninth Grade (Grade 9) Biochemistry Questions

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Grade 9 Macromolecules

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Animals utilize                 as an energy source that can be stored in the liver.
  1. proteins
  2. nucleic acids
  3. carbohydrates
  4. lipids
Grade 9 Macromolecules
What is the primary purpose and function of enzymes, in the context of reactions that occur within living cells?
  1. They lower the active site energy of the reaction.
  2. They lower the speed of the reaction.
  3. They lower the temperature of the reaction.
  4. They lower the activation energy of the reaction.
Grade 9 Macromolecules
The reactants in an enzyme-catalyzed reaction are called the
  1. active sites.
  2. elements.
  3. inhibitors.
  4. substrates.
Grade 9 Macromolecules
How do enzymes help chemical reactions to occur?
  1. They speed up reactions by adding more substrates to react with enzymes.
  2. They slow down reactions by increasing the activation energy.
  3. They speed up chemical reactions by lowering the activation energy required.
  4. They slow down reactions by changing the overall temperature of the reaction.
Grade 9 Biochemical Pathways
Which statement describes cellular respiration?
  1. the process of decomposing chemical energy stored in bonds into energy that can be used by the cell
  2. the process of creating food for the cell
  3. the process of combining oxygen and water to produce another substance to be transported
  4. the process of making proteins
Grade 9 Biochemical Pathways
Which process is NOT a stage of cell respiration?
  1. Calvin cycle
  2. Krebs cycle
  3. glycolysis
  4. electron transport chain
Grade 9 Macromolecules
Glucose and fructose are examples of
  1. double sugars.
  2. disaccharides.
  3. single sugars.
  4. polysaccharides.
Grade 9 Macromolecules
The energy needed to start a chemical reaction is called the
  1. lightning.
  2. heat energy.
  3. reaction energy.
  4. activation energy.
Grade 9 Biochemistry
What are the subunits that make up complex carbohydrates?
  1. amino acids
  2. nucleotides
  3. fatty acids
  4. monosaccharides
Grade 9 Macromolecules
Which pair is a monomer with its correct associated macromolecule?
  1. monosaccharide, lipid
  2. fatty acid, protein
  3. nucleotide, nucleic acid
  4. amino acid, carbohydrate
Grade 9 Macromolecules
Which is NOT a polysaccharide?
  1. glycogen
  2. starch
  3. sucrose
  4. cellulose
Grade 9 Macromolecules
DNA is a
  1. carbohydrate.
  2. fatty acid.
  3. lipid.
  4. nucleic acid.
Grade 9 Macromolecules
An enzyme will                         if the pH or temperature is not optimal.
  1. catalyze more reactions
  2. synthesize
  3. denature
  4. grow
Grade 9 Biochemical Pathways
The process by which plants use carbon dioxide, water, and light energy to make food is
  1. semipermeable.
  2. diffusion.
  3. osmosis.
  4. photosynthesis.
Grade 9 Macromolecules
Hydrophilic molecules are attracted to water.
  1. True
  2. False
Grade 9 Biochemical Pathways
When fermentation occurs in the absence of oxygen, it is                .
  1. aerobic
  2. anaerobic
  3. cyclic
  4. oxygen-rich
Grade 9 Biochemical Pathways
The process that best differentiates plants from animals is
  1. osmosis.
  2. photosynthesis.
  3. reproduction.
  4. respiration.
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