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

Protein core

Binding domain

Active site

Allosteric site

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

Proteins

Nucleic acids

Carbohydrates

Lipids

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

Structural

Antibody

Transport

Enzymatic

4. Which of the following is true about enzymes?

They lower the activation energy

They alter the equilibrium of the reaction

They are consumed during the reaction

They increase the temperature of the system

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

Disulfide bond

Ionic bond

Peptide bond

Hydrogen bond

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

Collagen

Myosin

Keratin

Hemoglobin

7. Which of the following best describes denaturation?

Increase in molecular weight

Loss of secondary and tertiary structure

Protein digestion

Protein synthesis

8. What is the role of enzymes in metabolism?

They regulate reaction speed

They store energy

They slow down reactions

They transport waste

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

Carbon

Nitrogen

Oxygen

Hydrogen

10. Which property of enzymes makes them highly specific?

Their shape

Their charge

Their solubility

Their mass

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

Ester bond

Hydrogen bond

Peptide bond

Glycosidic bond

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

Activates them

Enhances bonding

Denatures them

Freezes activity

13. What kind of protein is collagen?

Fibrous

Enzymatic

Globular

Hormonal

14. Which macromolecule category includes enzymes?

Nucleic acids

Carbohydrates

Proteins

Lipids

15. 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

16. Which type of protein is insulin?

Defensive protein

Transport protein

Hormonal protein

Structural protein

17. Which of the following best describes enzymes?

Storage proteins

Structural proteins

Catalytic proteins

Transport proteins

18. Which of the following enzymes breaks down proteins?

Pepsin

Amylase

Lipase

DNA polymerase

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

Pepsin

Protease

Amylase

Lipase

20. Which factor does NOT affect enzyme activity?

Substrate concentration

Color of enzyme

Temperature

21. What are the building blocks of proteins?

Nucleotides

Sugars

Amino acids

Fatty acids

22. Which of the following is a protein hormone?

Estrogen

Testosterone

Cortisol

Insulin

23. What is the quaternary structure of a protein?

The sequence of amino acids

A random coil structure

The 3D shape of a single polypeptide

The interaction between multiple polypeptide chains

24. Which enzyme breaks down hydrogen peroxide in cells?

Urease

Catalase

Amylase

Pepsin

25. What is the primary structure of a protein?

Sequence of amino acids

3D conformation

Folding of protein

Interaction between polypeptides

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26. Which vitamin is a coenzyme for many enzymes?

Vitamin K

Vitamin D

Vitamin B complex

Vitamin C

27. What is denaturation of a protein?

Breakdown of amino acids

Formation of peptide bonds

Synthesis of protein

Unfolding of protein structure

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

Participates in peptide bonding

Determines identity and properties of the amino acid

Stabilizes enzymes

Provides acidity

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

Assemble amino acids into proteins

Store amino acids

Transport proteins

Break down proteins

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

Lipase

Pepsin

Amylase

Trypsin

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

It denatures

It dissolves

It becomes inactive

It speeds up

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

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

Primary

Secondary

Tertiary

Quaternary

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

Catalysis

Energy storage

Genetic information storage

Transport

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

Its amino acid composition only

Its solubility

Its DNA sequence

Its primary structure

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

Linear structure

Secondary structure

Tertiary structure

Primary structure

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

Glucose

Water

Fats

Metal ions

38. Which of the following is a fibrous protein?

Myosin

Albumin

Hemoglobin

Insulin

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

Enzyme action

Ribosome structure

DNA

RNA polymerase

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

Pepsin

Insulin

Keratin

Hemoglobin

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

Amino group

Carboxyl group

Side chain (R group)

Phosphate group

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

Collagen

Hemoglobin

Actin

Myosin

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

It changes its DNA

It becomes inactive

It becomes more efficient

It duplicates

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

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

Coenzyme

Apoenzyme

Zymogen

Cofactor

46. Which protein is responsible for muscle contraction?

Actin

Amylase

Insulin

Hemoglobin

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

Trypsin

Lipase

Pepsin

Amylase

48. What is the main function of enzymes?

To act as structural components

To transport oxygen

To store energy

To speed up chemical reactions

49. Which of the following affects enzyme activity?

Color of enzyme

Cell size

Substrate concentration

DNA sequence

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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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