Quiz  /  Biochemistry Class 11 MCQ Questions With Answers

  • 1. 
    Bonds where there is unequal sharing of electrons are called:

  • Polar Covalent Bonds
  • Non-Polar Covalent Bonds
  • Ionic Bonds
  • London Forces

  • 2. 
    Fats are specialized lipid molecules, and enzymes are specialized protein molecules. How dothe functions of fats and enzymes differ?

  • Fats are structural building materials, while enzymes are transportation molecules.
  • Fats provide support for cells, while enzymes lower the pH of gastric fluids.
  • Fats regulate body functions, while enzymes denature invasive bacteria.
  • Fats are storage molecules, while enzymes are catalytic molecules.

  • 3. 
    Which is true about the structure of starch molecules and proteinmolecules?

  • Starches and proteins are both polymers.
  • Starches and proteins are both amino acids.
  • Starches and proteins are both built from simple sugars.
  • Starches and proteins are both built from nucleic acids.

  • 4. 
    Which organic molecule is primarily used by cells as a source of energy?

  • Amino Acid
  • Fatty Acid
  • Glucose
  • Protein

  • 5. 
    Attractions between water molecules are called

  • Covalent bonds
  • Ionic bonds
  • Polar bonds
  • Hydrogen bonds

  • 6. 
    Which letter represents the positive end?

  • A
  • B
  • C
  • D

  • 7. 
    All organisms contain DNA and RNA. What are the subunits of DNA and RNA?

  • simple sugars
  • amino acids
  • carbohydrates
  • nucleotides

  • 8. 
    Which organic compounds necessary for life are formed by a sugar bondedto a phosphate group and a nitrogenous base?

  • lipids
  • proteins
  • nucleic acids
  • carbohydrates

  • 9. 
    Building blocks of polymers.

  • monomer
  • polypeptide
  • monosaccharide
  • glycerol

  • 10. 
    Amylase is a biocatalyst that hydrolyzes starch into simple sugarmolecules in the pancreas. Which best describes amylase?

  • lipid
  • protein
  • fatty acid
  • carbohydrate

  • 11. 
    What is the significance of nucleic acids for cells?

  • They generate energy for the cell.
  • They restrict what enters and leaves the cell.
  • They support and maintain the shape of the cell.
  • They provide all instructions for cellular activities.

  • 12. 
    Which best explains enzyme specificity?

  • An enzyme reacts best at a certain pH.
  • An enzyme reacts best at a certain temperature.
  • An enzyme is able to react with only one substrate.
  • An enzyme is able to react with many different substrates.

  • 13. 
    Atoms that have gained or lost electrons are called:

  • Ions
  • Isotopes
  • Isomers
  • Neutrinos

  • 14. 
    Which of the following are the 4 essential elements that make up 96% of living matter?

  • H, O, N, P
  • C, O, N, H
  • C, O, S, H
  • O, S, P, N

  • 15. 
    Enzymes act as catalysts in biochemical reactions. Which is the enzyme?

  • w
  • x
  • y
  • wx

  • 16. 
    Carbon Tetrachloride (CCl4) is a __________ compound.

  • Ionic
  • Polar
  • Non-Polar
  • DiAtomic

  • 17. 
    Which best describes the role of hemoglobin in red blood cells?

  • It hydrates human body tissues.
  • It supplies support to human body tissues.
  • It transports oxygen to human body tissues.
  • It increases the rate of reactions in body tissues.

  • 18. 
    Which energy level has the highest amount of energy?

  • first shell (closest the nucleus)
  • second shell
  • third shell (farthest from nucleus)

  • 19. 
    Which of these statements describes how monomers combine and create macromolecules?

  • Amino acids combine to make proteins.
  • Glucose molecules combine to make nucleic acids.
  • Nucleic acids combine to make starch.
  • Proteins combine to make glucose.

  • 20. 
    Which is a function of lipids?

  • to supply cells with quick–release energy
  • to provide the body with insulation
  • to store genetic information
  • to regulate cell processes

  • 21. 
    Proteins are compounds formed in the cells of plants and animals. Which element is included in every protein molecule?

  • calcium
  • carbon
  • fluorine
  • sodium

  • 22. 
    Which organic molecule is paired with its function?

  • nucleic acid : to store energy
  • proteins : to provide insulation
  • lipids : to regulate metabolic processes
  • carbohydrate : to provide quick–release energy

  • 23. 
    This type of bond results from the gain or loss of electrons.

  • polar covalent bond
  • nonpolar covalent bond
  • hydrogen bond
  • ionic bond
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