About Biochemistry

Following are some of the multiple choice questions on the Biochemistry with answers that will help the students in developing their knowledge.

Biochemistry MCQ

1. What is a catalyst?

  • Process that changes one set of chemicals into another
  • Element or compound that enters into a chemical reaction
  • Element or compound produced by a chemical reaction
  • Substance that speeds up the rate of the chemical reaction

2. Which is the strongest acid?

  • ph of 1
  • ph of 4
  • ph of 7
  • ph of 9

3. Enzymes are

  • nucleic acids
  • proteins
  • lipids
  • carbohydrates

4. What is the function of a protein?

  • It is involved in short-term energy store.
  • It is involved in almost every function of the human body.
  • It transmits genetic information.
  • It is involved in long-term energy and body insulation.

5. Which of the following is correctly matched?

  • Proteins-nucleotides
  • Lipids-glycerol
  • Carbohydrates-amino acids
  • DNA-glucose
  • None of the above

6. What is a substrate?

  • The molecules that binds to the enzyme at the active site, and causes the enzyme to carry out a task.
  • The molecule that does not fit into an enzyme, and has no effect on the enzyme.
  • The molecule that binds to a place other than the active site, and caused the enzyme to carry out a task.
  • A water molecule that breaks down monomers.

7. Monomer of a protein

  • nucleotide
  • lipid
  • monosaccharide
  • amino acid

8. Examples of nucleic acids?

  • DNA and RNA
  • carbohydrates
  • potatoes
  • meats

9. DNA contain

  • Ribose sugar
  • Deoxy Ribose sugar
  • Arabinose
  • Any sugar

10. Which is the strongest base?

  • ph of 1
  • ph of 4
  • ph of 7
  • ph of 9

11. 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.

12. What is the function of nucleic acids?

  • store genetic information
  • store energy (long-term)
  • store energy (short-term)
  • build skin, hair, nails, muscles

13. Why does ice float?

  • As water freezes, it expands and its density decreases.
  • As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
  • As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
  • As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

14. Which of the following is NOT a carbohydrate?

  • Glucose
  • Lactose
  • Insulin
  • Starch
  • Sucrose

15. Which of the following is an organic compound?

  • H2O
  • C6H12O6
  • NH2
  • OH

16. How many different amino acids are there?

  • 4
  • 20
  • 6
  • 46

17. A base is a substance that

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

18. Nucleotides are monomers of

  • Carbohydrates
  • Lipids
  • Proteins
  • Nucleic Acids

19. What is the monomer of a lipid?

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

20. Lipids are made of

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

21. Monosaccharides are monomers of

  • Carbohydrates
  • Lipids
  • Proteins
  • Nucleic Acids

22. What elements make up carbohydrates?

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

23. Butter is an example of a

  • carbohydrate
  • unsaturated fat
  • saturated fat
  • protein

24. 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

25. What word describes when water is attracted to other substances?

  • cohesion
  • adhesion
  • capillary action
  • surface tension

26. How many calories per gram do carbohydrates contain?

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

27. Which is NOT a unique property of water?

  • Frozen water floats on liquid water.
  • Water covers most of the Earth’s surface and retains a large amount of heat.
  • Water molecules stick to each other through hydrogen bonds.
  • Water cools very rapidly.

28. Glucose is an example of a

  • Carbohydrate
  • Lipid
  • Protein
  • Nucleic Acid

29. How many valence electrons are in Phosphorus?

  • 1
  • 5
  • 3
  • 9

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

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

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

  • Adhesion
  • Suspension
  • Cohesion
  • Solution

32. All organic compounds contain the element

  • carbon
  • nitrogen
  • phosphorus
  • sulfur

33. What property of water helps to moderate earth's temperature?

  • adhesion
  • chohesion
  • Specific heat capacity
  • Latent heat of vaporization

34. Which formula represents an amino acid?

  • a.
  • b. 
  • c.
  • d.

35. 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.

36. What are the products of aerobic cellular respiration?

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

37. What products are produced during photosynthesis?

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

38. 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

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

  • electron and proton
  • proton and neutron
  • electron and neutron

40. How do enzymes speed up a reaction?

  • increase the activation energy
  • lower the activation energy
  • they add heat to the reaction
  • they decrease how many reactions can take place

41. Which of the following statements about enzymes is NOT true?

  • enzymes are reusable
  • enzymes work best at specific pH and temperatures
  • enzymes are lipids
  • enzymes are proteins

42. The energy needed to start a reaction

  • activation energy
  • adhesion energy
  • chemical energy
  • cohesion energy

43. Where do substrates bind on an enzyme?

  • voltage-gated channels
  • surface receptor
  • calcium channels
  • active site

44. Made of glycerol and fatty acids

  • Carbohydrates
  • Lipids
  • Proteins
  • Nucleic Acids

45. Which is not an example of a lipid?

  • lettuce
  • olive oil
  • butter
  • bacon fat

46. What determines a protein's function?

  • color
  • shape
  • size
  • temperature

47. The specific reactants that an enzyme acts on are called

  • catalysts
  • substrates
  • proteins
  • amino acids

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

  • Products
  • Coefficients
  • Precipitates
  • Reactants

49. 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.

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

  • 1:1
  • 2:1
  • 3:1
  • 4:1

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