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 macromolecule category includes enzymes?

Nucleic acids

Proteins

Carbohydrates

Lipids

2. Which of the following is a protein hormone?

Cortisol

Estrogen

Insulin

Testosterone

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

It duplicates

It becomes more efficient

It changes its DNA

It becomes inactive

4. Which type of protein is insulin?

Defensive protein

Structural protein

Transport protein

Hormonal protein

5. What is denaturation of a protein?

Breakdown of amino acids

Synthesis of protein

Formation of peptide bonds

Unfolding of protein structure

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

Cofactor

Apoenzyme

Coenzyme

Zymogen

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

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

The substrate is broken into multiple enzymes

The enzyme slightly changes shape to bind the substrate

The enzyme and substrate fit perfectly like a lock and key

The enzyme permanently changes shape

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

Genetic information storage

Transport

Catalysis

Energy storage

10. Which enzyme breaks down hydrogen peroxide in cells?

Pepsin

Amylase

Catalase

Urease

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

Break down proteins

Store amino acids

Transport proteins

Assemble amino acids into proteins

12. What is the quaternary structure of a protein?

The 3D shape of a single polypeptide

A random coil structure

The interaction between multiple polypeptide chains

The sequence of amino acids

13. What are the building blocks of proteins?

Nucleotides

Amino acids

Fatty acids

Sugars

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

Metal ions

Water

Fats

Glucose

15. Which factor does NOT affect enzyme activity?

Temperature

Substrate concentration

Color of enzyme

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

Peptide bond

Hydrogen bond

Ester bond

Glycosidic bond

17. Which of the following affects enzyme activity?

Color of enzyme

Substrate concentration

Cell size

DNA sequence

18. What is the primary structure of a protein?

3D conformation

Interaction between polypeptides

Sequence of amino acids

Folding of protein

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

20. Which vitamin is a coenzyme for many enzymes?

Vitamin C

Vitamin K

Vitamin D

Vitamin B complex

21. Which of the following is true about enzymes?

They increase the temperature of the system

They alter the equilibrium of the reaction

They are consumed during the reaction

They lower the activation energy

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

Secondary structure

Primary structure

Tertiary structure

Linear structure

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

Hemoglobin

Myosin

Collagen

Keratin

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

Myosin

Collagen

Hemoglobin

Actin

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

Lipase

Amylase

Protease

Pepsin

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

Binding domain

Active site

Protein core

Allosteric site

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

Keratin

Insulin

Pepsin

Hemoglobin

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

Determines identity and properties of the amino acid

Participates in peptide bonding

Stabilizes enzymes

Provides acidity

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

Carbon

Hydrogen

Oxygen

Nitrogen

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

It dissolves

It becomes inactive

It speeds up

It denatures

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

Tertiary

Quaternary

Secondary

Primary

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

Carbohydrates

Nucleic acids

Proteins

Lipids

33. What is the main function of enzymes?

To transport oxygen

To store energy

To speed up chemical reactions

To act as structural components

34. Which of the following is a fibrous protein?

Myosin

Albumin

Hemoglobin

Insulin

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

Phosphate group

Side chain (R group)

Carboxyl group

Amino group

36. Which property of enzymes makes them highly specific?

Their solubility

Their mass

Their charge

Their shape

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

Hydrogen bond

Ionic bond

Disulfide bond

Peptide bond

38. Which of the following best describes enzymes?

Catalytic proteins

Structural proteins

Transport proteins

Storage proteins

39. What kind of protein is collagen?

Hormonal

Enzymatic

Globular

Fibrous

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

Enzymatic

Structural

Transport

Antibody

41. Which of the following best describes denaturation?

Increase in molecular weight

Loss of secondary and tertiary structure

Protein digestion

Protein synthesis

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

Enhances bonding

Activates them

Denatures them

Freezes activity

43. Which of the following enzymes breaks down proteins?

Pepsin

DNA polymerase

Amylase

Lipase

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

Its DNA sequence

Its amino acid composition only

Its primary structure

Its solubility

45. Which protein is responsible for muscle contraction?

Actin

Amylase

Hemoglobin

Insulin

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

Enzyme action

RNA polymerase

Ribosome structure

DNA

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

Trypsin

Pepsin

Lipase

Amylase

48. What is the role of enzymes in metabolism?

They store energy

They regulate reaction speed

They slow down reactions

They transport waste

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

Pepsin

Lipase

Trypsin

Amylase

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Mustansar KhanLast Updated: October 14, 2025

Important Macro Molecules Question and Answer

Chemistry Macro Molecules Practice Test Online With Explanation

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