Chemistry Macro Molecules Online Mcqs Test

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Question 1

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

Question 2

2. Which of the following is a protein hormone?

Answer

Testosterone

Question 3

3. Which of the following is true about enzymes?

Answer

They alter the equilibrium of the reaction

Answer

They are consumed during the reaction

Answer

They increase the temperature of the system

Answer

They lower the activation energy

Question 4

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

Answer

It becomes inactive

Answer

It dissolves

Answer

It denatures

Answer

It speeds up

Question 5

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

Answer

Tertiary structure

Answer

Primary structure

Answer

Secondary structure

Answer

Linear structure

Question 6

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

Answer

Metal ions

Question 7

7. What kind of protein is collagen?

Question 8

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

Answer

Store amino acids

Answer

Transport proteins

Answer

Break down proteins

Answer

Assemble amino acids into proteins

Question 9

9. What is the role of enzymes in metabolism?

Answer

They regulate reaction speed

Answer

They slow down reactions

Answer

They transport waste

Answer

They store energy

Question 10

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

Question 11

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

Question 12

12. What is the quaternary structure of a protein?

Answer

A random coil structure

Answer

The sequence of amino acids

Answer

The interaction between multiple polypeptide chains

Answer

The 3D shape of a single polypeptide

Question 13

13. Which enzyme breaks down hydrogen peroxide in cells?

Question 14

14. What are the building blocks of proteins?

Answer

Fatty acids

Answer

Nucleotides

Answer

Amino acids

Question 15

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

Question 16

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

Question 17

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

Answer

Ester bond

Answer

Hydrogen bond

Answer

Glycosidic bond

Answer

Peptide bond

Question 18

18. Which of the following affects enzyme activity?

Answer

DNA sequence

Answer

Substrate concentration

Answer

Color of enzyme

Question 19

19. Which of the following best describes enzymes?

Answer

Storage proteins

Answer

Catalytic proteins

Answer

Transport proteins

Answer

Structural proteins

Question 20

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

Answer

Nucleic acids

Answer

Carbohydrates

Question 21

21. What is denaturation of a protein?

Answer

Breakdown of amino acids

Answer

Unfolding of protein structure

Answer

Synthesis of protein

Answer

Formation of peptide bonds

Question 22

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

Answer

Its amino acid composition only

Answer

Its solubility

Answer

Its DNA sequence

Answer

Its primary structure

Question 23

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

Answer

Active site

Answer

Binding domain

Answer

Allosteric site

Answer

Protein core

Question 24

24. Which protein is responsible for muscle contraction?

Answer

Hemoglobin

Question 25

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

Answer

Hemoglobin

Question 26

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

Answer

Energy storage

Answer

Genetic information storage

Question 27

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

Answer

Enzyme action

Answer

RNA polymerase

Answer

Ribosome structure

Question 28

28. Which property of enzymes makes them highly specific?

Answer

Their solubility

Answer

Their shape

Answer

Their charge

Answer

Their mass

Question 29

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

Answer

Quaternary

Question 30

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

Answer

Participates in peptide bonding

Answer

Determines identity and properties of the amino acid

Answer

Stabilizes enzymes

Answer

Provides acidity

Question 31

31. What is the primary structure of a protein?

Answer

Interaction between polypeptides

Answer

3D conformation

Answer

Folding of protein

Answer

Sequence of amino acids

Question 32

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

Answer

Phosphate group

Answer

Amino group

Answer

Carboxyl group

Answer

Side chain (R group)

Question 33

33. Which of the following enzymes breaks down proteins?

Answer

DNA polymerase

Question 34

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

Question 35

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

Answer

It becomes inactive

Answer

It changes its DNA

Answer

It duplicates

Answer

It becomes more efficient

Question 36

36. What is the main function of enzymes?

Answer

To act as structural components

Answer

To speed up chemical reactions

Answer

To transport oxygen

Answer

To store energy

Question 37

37. Which factor does NOT affect enzyme activity?

Answer

Substrate concentration

Answer

Color of enzyme

Answer

Temperature

Question 38

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

Answer

Structural

Question 39

39. Which of the following is a fibrous protein?

Answer

Hemoglobin

Question 40

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

Answer

The enzyme slightly changes shape to bind the substrate

Answer

The enzyme permanently changes shape

Answer

The substrate is broken into multiple enzymes

Answer

The enzyme and substrate fit perfectly like a lock and key

Question 41

41. Which of the following best describes denaturation?

Answer

Protein digestion

Answer

Protein synthesis

Answer

Loss of secondary and tertiary structure

Answer

Increase in molecular weight

Question 42

42. Which vitamin is a coenzyme for many enzymes?

Answer

Vitamin B complex

Question 43

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

Answer

Peptide bond

Answer

Disulfide bond

Answer

Ionic bond

Answer

Hydrogen bond

Question 44

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

Question 45

45. Which type of protein is insulin?

Answer

Hormonal protein

Answer

Structural protein

Answer

Transport protein

Answer

Defensive protein

Question 46

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

Answer

Hemoglobin

Question 47

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

Answer

Hemoglobin

Question 48

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

Answer

Denatures them

Answer

Freezes activity

Answer

Enhances bonding

Answer

Activates them

Question 49

49. Which macromolecule category includes enzymes?

Answer

Nucleic acids

Answer

Carbohydrates

Question 50

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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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