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Chemistry Macro Molecules Online Mcqs Test

Mustansar KhanLast Updated: October 14, 2025

Important Macro Molecules Question and Answer

Total Questions:	50
Time Allowed:	30 Minutes
Total Marks:	50
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Chemistry Macro Molecules Practice Test Online With Explanation

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1. Which vitamin is a coenzyme for many enzymes?

Vitamin C

Vitamin D

Vitamin K

Vitamin B complex

2. Which property of enzymes makes them highly specific?

Their shape

Their charge

Their solubility

Their mass

3. Which of the following is a cofactor often required by enzymes?

Metal ions

Fats

Glucose

Water

4. Which of the following best describes denaturation?

Increase in molecular weight

Loss of secondary and tertiary structure

Protein synthesis

Protein digestion

5. Which of the following enzymes functions in the stomach?

Amylase

Trypsin

Lipase

Pepsin

6. Which protein is responsible for muscle contraction?

Amylase

Insulin

Actin

Hemoglobin

7. Which of the following is a protein hormone?

Estrogen

Cortisol

Testosterone

Insulin

8. What is denaturation of a protein?

Formation of peptide bonds

Breakdown of amino acids

Synthesis of protein

Unfolding of protein structure

9. What is the optimum pH for most enzymes in the human body?

10. Which of the following enzymes breaks down proteins?

Lipase

Pepsin

Amylase

DNA polymerase

11. What is the three-dimensional structure of a protein called?

Secondary structure

Tertiary structure

Linear structure

Primary structure

12. What is the inactive form of an enzyme called?

Coenzyme

Cofactor

Apoenzyme

Zymogen

13. What kind of protein is collagen?

Fibrous

Enzymatic

Hormonal

Globular

14. Which of the following is not a function of proteins?

Genetic information storage

Energy storage

Transport

Catalysis

15. What is the quaternary structure of a protein?

A random coil structure

The interaction between multiple polypeptide chains

The 3D shape of a single polypeptide

The sequence of amino acids

16. Which level of protein structure is determined by hydrogen bonding between nearby amino acids?

Secondary

Tertiary

Primary

Quaternary

17. What determines the sequence of amino acids in a protein?

DNA

Ribosome structure

RNA polymerase

Enzyme action

18. What happens to an enzyme when its shape is changed?

It becomes inactive

It becomes more efficient

It duplicates

It changes its DNA

19. What is the effect of high temperature on most enzymes?

Freezes activity

Denatures them

Activates them

Enhances bonding

20. Which of the following are macromolecules composed of amino acids?

Carbohydrates

Proteins

Nucleic acids

Lipids

21. What are the building blocks of proteins?

Nucleotides

Sugars

Amino acids

Fatty acids

22. Which macromolecule category includes enzymes?

Lipids

Proteins

Nucleic acids

Carbohydrates

23. Which enzyme breaks down fats in the human body?

Amylase

Protease

Pepsin

Lipase

24. What happens in the induced fit model of enzyme action?

The enzyme slightly changes shape to bind the substrate

The enzyme permanently changes shape

The enzyme and substrate fit perfectly like a lock and key

The substrate is broken into multiple enzymes

25. What is the role of enzymes in metabolism?

They transport waste

They store energy

They regulate reaction speed

They slow down reactions

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26. Which bond is broken during the hydrolysis of proteins?

Disulfide bond

Ionic bond

Hydrogen bond

Peptide bond

27. Which of the following affects enzyme activity?

DNA sequence

Color of enzyme

Substrate concentration

Cell size

28. What is the primary structure of a protein?

Sequence of amino acids

Folding of protein

Interaction between polypeptides

3D conformation

29. Which enzyme is present in saliva and begins the digestion of carbohydrates?

Pepsin

Lipase

Trypsin

Amylase

30. What happens when an enzyme is exposed to a pH far from its optimum?

It becomes inactive

It speeds up

It denatures

It dissolves

31. Which enzyme breaks down hydrogen peroxide in cells?

Pepsin

Urease

Amylase

Catalase

32. How many different amino acids are used in the synthesis of proteins in the human body?

33. What is the main role of the R group in amino acids?

Determines identity and properties of the amino acid

Provides acidity

Participates in peptide bonding

Stabilizes enzymes

34. Which of the following is a fibrous protein?

Hemoglobin

Myosin

Albumin

Insulin

35. What is the region where an enzyme binds its substrate?

Active site

Protein core

Allosteric site

Binding domain

36. What is the main function of enzymes?

To speed up chemical reactions

To act as structural components

To transport oxygen

To store energy

37. Which type of protein is insulin?

Structural protein

Transport protein

Hormonal protein

Defensive protein

38. Which factor does NOT affect enzyme activity?

Substrate concentration

Temperature

Color of enzyme

39. Which element is unique to proteins compared to carbohydrates and fats?

Oxygen

Hydrogen

Nitrogen

Carbon

40. Which type of bond links amino acids in a protein?

Peptide bond

Glycosidic bond

Hydrogen bond

Ester bond

41. Which component is not found in all amino acids?

Phosphate group

Amino group

Side chain (R group)

Carboxyl group

42. Which type of protein helps defend the body against pathogens?

Antibody

Structural

Transport

Enzymatic

43. Which of the following is true about enzymes?

They lower the activation energy

They alter the equilibrium of the reaction

They increase the temperature of the system

They are consumed during the reaction

44. Which of the following is an example of a globular protein?

Collagen

Hemoglobin

Myosin

Keratin

45. Which protein is found abundantly in red blood cells?

Myosin

Actin

Hemoglobin

Collagen

46. Which of the following best describes enzymes?

Storage proteins

Structural proteins

Catalytic proteins

Transport proteins

47. Which of the following proteins has a structural role?

Insulin

Pepsin

Hemoglobin

Keratin

48. What is the function of ribosomes in protein synthesis?

Transport proteins

Assemble amino acids into proteins

Break down proteins

Store amino acids

49. Which of the following determines the function of a protein?

Its amino acid composition only

Its DNA sequence

Its solubility

Its primary structure

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Mustansar KhanLast Updated: October 14, 2025

Chemistry Macro Molecules Online Mcqs Test

Important Macro Molecules Question and Answer

Chemistry Macro Molecules Practice Test Online With Explanation

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