About Biochemistry

Below are best multiple choice questions on Biochemistry along with answers that help you to revise your Biochemistry skills before exams.

Biochemistry MCQ Questions With Answers

Q1. Which one isn't a biomolecule?

  • Carbohydrate
  • Lipids
  • Proteins
  • Nitrogen bases

Q2. The bond that joins two amino acids together

  • double bond
  • hydrogen bond
  • ionic bond
  • peptide bond

Q3. Which best explains the purpose of the active site of an enzyme?

  • The active site is for the attachment of the substrate.
  • The active site changes to fit any available substrate.
  • The active site determines how many reactions will be catalyzed.
  • The active site determines how fast the reaction is allowed to occur.

Q4. Which best describes how an enzyme affects the rate of a chemicalreaction?

  • It increases the temperature of the reaction.
  • It lowers the activation energy of the reaction.
  • It changes the products created in the reaction.
  • It causes the reaction to proceed in an unfavorable direction.

Q5. Which is the correct formula for a polysaccharide?

  • C6H12O6
  • C12H24O12
  • C12H22O11
  • (C6H10O5)n

Q6. Why are enzymes essential to all multicellular organisms?

  • They provide insulation.
  • They produce living tissue.
  • They contain genetic information.
  • They catalyze metabolic reactions.

Q7. 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.

Q8. 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.

Q9. Made of monomers of monosaccharides

  • Carbohydrates
  • Lipids
  • Proteins
  • Nucleic Acids

Q10. Made of monomers of nucleotides

  • Carbohydrates
  • Lipids
  • Proteins
  • Nucleic Acids

Q11. 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.

Q12. Which are the building blocks of most lipid molecules?

  • glucose and protein
  • glucose and fatty acids
  • fatty acids and glycerol
  • amino acids and glycerol

Q13. Which type of substances serves as a catalyst for reactions that break large food molecules intosmaller useful molecules?

  • enzymes
  • vitamins
  • lipids
  • nucleotides

Q14. How many calories does a protein contain per gram?

  • 0 cal/g
  • 11 cal/g
  • 4 cal/g
  • 9 cal/g

Q15. Which is not a use or function of protein?

  • forms enzymes and hormones
  • forms transport channel in cell membrane
  • forms structural proteins in the body
  • quick energy

Q16. Which one is NOT a function for Carbohydrates?

  • Short Term Energy
  • Cell walls
  • Digestion
  • Plant Structure

Q17. Water molecules are

  • cohesive
  • adhesive
  • nonpolar
  • both a and b

Q18. How many atoms of carbon (C) are in C6H12O6?

  • 3
  • 6
  • 12
  • 24

Q19. ______ are examples of carbohydrates

  • guanine & cytosine
  • glucose & fructose
  • glycine & glutamine
  • samose & deanose

Q20. How many calories per gram do carbohydrates contain?

  • 4 cal/g
  • 0 cal/g
  • 9 cal/g
  • 10 cal/g

Q21. Which is not an example of a lipid?

  • lettuce
  • olive oil
  • butter
  • bacon fat

Q22. Nucleotides are monomers of

  • Carbohydrates
  • Lipids
  • Proteins
  • Nucleic Acids

Q23. Monosaccharides are monomers of

  • Carbohydrates
  • Lipids
  • Proteins
  • Nucleic Acids

Q24. What determines a protein's function?

  • color
  • shape
  • size
  • temperature

Q25. Lipids are made of

  • Fatty acid only
  • Glycerol only
  • Both glycerol and fatty acid
  • Non of the above

Q26. The substances listed on the left side of a chemical equation are the

  • Products
  • Coefficients
  • Precipitates
  • Reactants

Q27. Which of the following is NOT a carbohydrate?

  • Lactose
  • Insulin
  • Starch
  • Sucrose

Q28. What particles are found in the nucleus of an atom?

  • electron and proton
  • proton and neutron
  • electron and neutron
  • none of the above

Q29. Which of the following is an organic compound?

  • H2O
  • C6H12O6
  • NH2
  • OH

Q30. Water is classified as an inorganic compound because it

  • does not contain carbon
  • does not contain nitrogen
  • contains hydrogen
  • contains oxygen

Q31. What elements make up carbohydrates?

  • carbon, nitrogen, hydrogen, oxygen
  • carbon, oxygen, phosphours
  • carbon, nitrogen, oxygen
  • carbon, hydrogen, oxygen

Q32. To which class of organic compounds do enzymes belong?

  • proteins
  • fatty acids
  • nucleic acids
  • monosaccharides

Q33. What is the ratio of hydrogen to oxygen in carbohydrates?

  • 1:1
  • 2:1
  • 3:1
  • 4:1

Q34. What is the function of carbohydrates in your body?

  • Speed up chemical reactions.
  • Give immediate energy.
  • Help to store energy.
  • Build cell walls in plants.

Q35. 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.

Q36. Which organic molecule serves as a catalyst?

  • lipids
  • proteins
  • nucleic acid
  • carbohydrates

Q37. Which best explains the function of the sequence of nucleotides?

  • It provides energy.
  • It determines the shape of the DNA molecule.
  • It allows DNA to be successfully copied.
  • It carries genetic information.

Q38. 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

Q39. What products are produced during photosynthesis?

  • chloride and sugar
  • oxygen and sugar
  • carbon dioxide and sugar
  • nitrogen and sugar

Q40. What are the products of aerobic cellular respiration?

  • glucose and water
  • glucose and oxygen
  • carbon, hydrogen, and water
  • carbon dioxide, water, and energy

Q41. How do photosynthesis and cellular respiration differ?

  • Photosynthesis uses food and cellular respiration produces food.
  • Photosynthesis uses oxygen and cellular respiration uses carbon dioxide.
  • Photosynthesis breaks down carbohydrates and cellular respiration produces carbohydrates.
  • Photosynthesis gives off oxygen and cellular respiration uses oxygen.

Q42. What is the monomer of a lipid?

  • Nucleotide
  • Fatty Acid & Glycerol
  • Polysaccharide
  • Amino Acid

Q43. What is the function of a nucleic acid?

  • it transmits genetic information.
  • It is involved in body insulation.
  • It provides your body with the energy it needs.
  • It is involved in energy storage.

Q44. All organic compounds contain the element

  • carbon
  • nitrogen
  • phosphorus
  • sulfur

Q45. What is the attraction between molecules of different substances?

  • Adhesion
  • Suspension
  • Cohesion
  • Solution

Q46. Which energy level has the highest amount of energy?

  • second shell
  • first shell (closest the nucleus)
  • third shell (farthest from nucleus)
  • None of these

Q47. How many valence electrons are in Phosphorus?

  • 1
  • 5
  • 3
  • 9

Q48. A base is a substance that

  • does not release any ions when dissolved in water
  • releases Hydrogen ions when dissolved in water
  • releases Hydroxide ions when dissolved in water
  • All of above

Q49. What is the purpose of an enzyme?

  • block an unwanted chemical reaction
  • create activation energy
  • cause or speed up a chemical reaction
  • permanently bond with a substrate

Q50. Butter is an example of a

  • carbohydrate
  • unsaturated fat
  • saturated fat
  • protein

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