About Biochemistry

The study of molecular biology and cell biology are both covered in depth throughout the Introduction to Biochemistry course. The field of study known as molecular biology is important because it focuses on the molecules that are responsible for the structure of organs and cells. This article discusses carbon compounds and the reactions that occur as a result of their presence in living organisms. In addition to this, it discusses molecular physiology, which refers to the roles that molecules play in catering the requirements of the organs and cells of the body.

The primary focus of this field is the investigation of the composition and roles played by biomolecules, including carbohydrates, proteins, acids, and lipids. As a result, it is also known as molecular biology.


In 1930, Carl Neuberg, the pioneer of biochemistry, presented this word to us. An organism's chemical structure is studied in this subject, which integrates biology and chemistry. By investigating the chemical reactions and combinations that play a role in a variety of processes, such as reproduction, hereditary makeup, metabolism and growth, biochemists get to work in a variety of labs.

Importance of Biochemistry

In order to grasp the following concepts, biochemistry is required-

  • For example, the chemical processes that convert food into molecules that are exclusive to the cells of a particular species.
  • Biochemical processes facilitated by enzyme catalysis.
  • Utilizing the potential energy acquired from the oxidation of food ingested for the numerous energy-demanding activities in the living cell.
  • Substances that make up tissues and cells have characteristics and structures.
  • To find answers to basic medical and biological questions.

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. Which of the following is correctly matched?

  • Proteins-nucleotides
  • Lipids-glycerol
  • Carbohydrates-amino acids
  • DNA-glucose

5. 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.

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. DNA contain

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

9. Examples of nucleic acids?

  • DNA and RNA
  • carbohydrates
  • potatoes
  • meats

10. Which is the strongest base?

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

11. Animals store carbohydrates as _______________ while plants store carbohydrates as ______________.

  • glycogen, starch
  • sugar, starch
  • starch, glucose
  • glycogen, glucose

12. Amino acids are the monomers of

  • Carbohydrates 
  • Lipids
  • Proteins 
  • Nucleic Acids

13. How many atoms are there TOTAL in:H2SO4

  • 6
  • 5
  • 7
  • 3

14. 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

15. How many valence electrons are present in Carbon?

  • 6
  • 4
  • 3
  • 8

16. How many calories per gram do lipids contain?

  • 9 cal/g
  • 0 cal/g
  • 4 cal/g
  • 7 cal/g

17. The element _______is found in all of the organic compounds.

  • Iron
  • Nitrogen
  • Carbon
  • Oxygen

18. 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.

19. What is the function of nucleic acids?

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

20. Which of the following is NOT a carbohydrate?

  • Lactose
  • Insulin
  • Starch
  • Sucrose

21. Which of the following is an organic compound?

  • H2O
  • C6H12O6
  • NH2
  • OH

22. 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.

23. ______ are examples of carbohydrates

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

24. How many calories per gram do carbohydrates contain?

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

25. 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

26. How many different amino acids are there?

  • 4
  • 20
  • 6
  • 46

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

  • 3
  • 6
  • 12
  • 24

28. Nucleotides are monomers of

  • Carbohydrates
  • Lipids
  • Proteins
  • Nucleic Acids

29. What is the monomer of a lipid?

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

30. Lipids are made of

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

31. Monosaccharides are monomers of

  • Carbohydrates
  • Lipids
  • Proteins
  • Nucleic Acids

32. What elements make up carbohydrates?

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

33. 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

34. Butter is an example of a

  • carbohydrate
  • unsaturated fat
  • saturated fat
  • protein

35. Which is not an example of a lipid?

  • lettuce
  • olive oil
  • butter
  • bacon fat

36. What determines a protein's function?

  • color
  • shape
  • size
  • temperature

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

  • Products
  • Coefficients
  • Precipitates
  • Reactants

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

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

39. Water is classified as an inorganic compound because it

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

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

  • proteins
  • fatty acids
  • nucleic acids
  • monosaccharides

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

  • 1:1
  • 2:1
  • 3:1
  • 4:1

42. 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.

43. 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.

44. Which organic molecule serves as a catalyst?

  • lipids
  • proteins
  • nucleic acid
  • carbohydrates

45. 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.

46. 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

47. What products are produced during photosynthesis?

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

48. What are the products of aerobic cellular respiration?

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

49. 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.

50. All organic compounds contain the element

  • carbon
  • nitrogen
  • phosphorus
  • sulfur

Enjoyed the Quiz. Share this with friends


Add Your Review

Your email address will not be published.

Subscribe to Newsletter!

Subscribe to get latest updates and information.