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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 of the following is a cofactor often required by enzymes?

Fats

Water

Metal ions

Glucose

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

Ribosome structure

Enzyme action

DNA

RNA polymerase

3. Which enzyme breaks down hydrogen peroxide in cells?

Amylase

Urease

Catalase

Pepsin

4. Which of the following is true about enzymes?

They increase the temperature of the system

They lower the activation energy

They are consumed during the reaction

They alter the equilibrium of the reaction

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

Transport

Structural

Enzymatic

Antibody

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

Tertiary

Primary

Quaternary

Secondary

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

Lipids

Carbohydrates

Nucleic acids

Proteins

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

Pepsin

Amylase

Trypsin

Lipase

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

The enzyme permanently changes shape

The enzyme and substrate fit perfectly like a lock and key

The substrate is broken into multiple enzymes

The enzyme slightly changes shape to bind the substrate

10. Which factor does NOT affect enzyme activity?

Color of enzyme

Substrate concentration

Temperature

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

Actin

Hemoglobin

Collagen

Myosin

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

Catalysis

Genetic information storage

Energy storage

Transport

13. What is the quaternary structure of a protein?

A random coil structure

The interaction between multiple polypeptide chains

The sequence of amino acids

The 3D shape of a single polypeptide

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

It becomes inactive

It speeds up

It dissolves

It denatures

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

Assemble amino acids into proteins

Break down proteins

Store amino acids

Transport proteins

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

17. Which of the following affects enzyme activity?

Color of enzyme

DNA sequence

Substrate concentration

Cell size

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

Keratin

Pepsin

Insulin

Hemoglobin

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

Enhances bonding

Freezes activity

Denatures them

Activates them

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

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

Zymogen

Apoenzyme

Cofactor

Coenzyme

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

Oxygen

Nitrogen

Hydrogen

Carbon

23. What kind of protein is collagen?

Hormonal

Globular

Fibrous

Enzymatic

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

Peptide bond

Ionic bond

Hydrogen bond

Disulfide bond

25. Which of the following enzymes breaks down proteins?

Amylase

Lipase

DNA polymerase

Pepsin

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26. What is the primary structure of a protein?

Folding of protein

Sequence of amino acids

Interaction between polypeptides

3D conformation

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

Secondary structure

Primary structure

Linear structure

Tertiary structure

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

Myosin

Hemoglobin

Collagen

Keratin

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

It becomes more efficient

It becomes inactive

It duplicates

It changes its DNA

30. Which protein is responsible for muscle contraction?

Insulin

Hemoglobin

Actin

Amylase

31. What are the building blocks of proteins?

Amino acids

Nucleotides

Sugars

Fatty acids

32. What is denaturation of a protein?

Formation of peptide bonds

Unfolding of protein structure

Synthesis of protein

Breakdown of amino acids

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

Its amino acid composition only

Its primary structure

Its DNA sequence

Its solubility

34. Which of the following best describes denaturation?

Protein digestion

Protein synthesis

Increase in molecular weight

Loss of secondary and tertiary structure

35. Which vitamin is a coenzyme for many enzymes?

Vitamin B complex

Vitamin D

Vitamin K

Vitamin C

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

Trypsin

Lipase

Pepsin

Amylase

37. Which type of protein is insulin?

Transport protein

Hormonal protein

Structural protein

Defensive protein

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

Ester bond

Glycosidic bond

Hydrogen bond

Peptide bond

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

Stabilizes enzymes

Determines identity and properties of the amino acid

Participates in peptide bonding

Provides acidity

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

Amino group

Side chain (R group)

Carboxyl group

Phosphate group

41. Which of the following is a protein hormone?

Testosterone

Insulin

Cortisol

Estrogen

42. What is the main function of enzymes?

To transport oxygen

To act as structural components

To store energy

To speed up chemical reactions

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

Active site

Binding domain

Protein core

Allosteric site

44. Which of the following is a fibrous protein?

Insulin

Myosin

Albumin

Hemoglobin

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

Amylase

Protease

Lipase

Pepsin

46. What is the role of enzymes in metabolism?

They regulate reaction speed

They transport waste

They store energy

They slow down reactions

47. Which property of enzymes makes them highly specific?

Their mass

Their solubility

Their shape

Their charge

48. Which of the following best describes enzymes?

Catalytic proteins

Transport proteins

Storage proteins

Structural proteins

49. Which macromolecule category includes enzymes?

Lipids

Nucleic acids

Proteins

Carbohydrates

Complete Guide for Chemistry Macro Molecules Online Mcqs Test

Chemistry Macro Molecules Online Mcqs Test is a crucial part of the selection process for government jobs and entrance exams. This online test allows you to practice without any cost.

Why Take This Test?

We have compiled these questions from past papers of PPSC, FPSC, NTS, and OTS. By attempting this quiz, you will:

Understand the difficulty level of the actual exam.
Identify your weak areas in General Knowledge and Current Affairs.

Note: At the end of the quiz, you will see a detailed result card with the correct answers.

Important Macro Molecules Question and Answer

Chemistry Macro Molecules Practice Test Online With Explanation

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Complete Guide for Chemistry Macro Molecules Online Mcqs Test

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