Chemistry Macro Molecules Online Mcqs Test

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Question 1

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

Question 2

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

Answer

Hemoglobin

Question 3

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

Answer

Tertiary structure

Answer

Primary structure

Answer

Linear structure

Answer

Secondary structure

Question 4

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

Answer

Quaternary

Question 5

5. Which of the following best describes denaturation?

Answer

Protein synthesis

Answer

Increase in molecular weight

Answer

Protein digestion

Answer

Loss of secondary and tertiary structure

Question 6

6. Which enzyme breaks down hydrogen peroxide in cells?

Question 7

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

Answer

Binding domain

Answer

Protein core

Answer

Allosteric site

Answer

Active site

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 quaternary structure of a protein?

Answer

The 3D shape of a single polypeptide

Answer

A random coil structure

Answer

The sequence of amino acids

Answer

The interaction between multiple polypeptide chains

Question 10

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

Answer

Genetic information storage

Answer

Energy storage

Question 11

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

Answer

Hemoglobin

Question 12

12. Which protein is responsible for muscle contraction?

Answer

Hemoglobin

Question 13

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

Question 14

14. Which of the following is a protein hormone?

Answer

Testosterone

Question 15

15. Which vitamin is a coenzyme for many enzymes?

Answer

Vitamin B complex

Question 16

16. What are the building blocks of proteins?

Answer

Amino acids

Answer

Nucleotides

Answer

Fatty acids

Question 17

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

Question 18

18. Which of the following is a fibrous protein?

Answer

Hemoglobin

Question 19

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

Answer

It duplicates

Answer

It becomes more efficient

Answer

It becomes inactive

Answer

It changes its DNA

Question 20

20. Which of the following best describes enzymes?

Answer

Structural proteins

Answer

Catalytic proteins

Answer

Storage proteins

Answer

Transport proteins

Question 21

21. What kind of protein is collagen?

Question 22

22. What is the main function of enzymes?

Answer

To store energy

Answer

To transport oxygen

Answer

To act as structural components

Answer

To speed up chemical reactions

Question 23

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

Answer

It speeds up

Answer

It denatures

Answer

It dissolves

Answer

It becomes inactive

Question 24

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

Answer

Hemoglobin

Question 25

25. Which macromolecule category includes enzymes?

Answer

Nucleic acids

Answer

Carbohydrates

Question 26

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

Answer

Side chain (R group)

Answer

Amino group

Answer

Phosphate group

Answer

Carboxyl group

Question 27

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

Question 28

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

Question 29

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

Answer

Provides acidity

Answer

Participates in peptide bonding

Answer

Determines identity and properties of the amino acid

Answer

Stabilizes enzymes

Question 30

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

Answer

Ribosome structure

Answer

Enzyme action

Answer

RNA polymerase

Question 31

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

Question 32

32. Which property of enzymes makes them highly specific?

Answer

Their solubility

Answer

Their charge

Answer

Their mass

Answer

Their shape

Question 33

33. What is denaturation of a protein?

Answer

Unfolding of protein structure

Answer

Breakdown of amino acids

Answer

Formation of peptide bonds

Answer

Synthesis of protein

Question 34

34. Which factor does NOT affect enzyme activity?

Answer

Substrate concentration

Answer

Temperature

Answer

Color of enzyme

Question 35

35. Which of the following affects enzyme activity?

Answer

Substrate concentration

Answer

Color of enzyme

Answer

DNA sequence

Question 36

36. Which of the following is true about enzymes?

Answer

They lower the activation energy

Answer

They are consumed during the reaction

Answer

They alter the equilibrium of the reaction

Answer

They increase the temperature of the system

Question 37

37. What is the role of enzymes in metabolism?

Answer

They transport waste

Answer

They slow down reactions

Answer

They regulate reaction speed

Answer

They store energy

Question 38

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

Answer

Denatures them

Answer

Enhances bonding

Answer

Freezes activity

Answer

Activates them

Question 39

39. Which type of protein is insulin?

Answer

Transport protein

Answer

Hormonal protein

Answer

Defensive protein

Answer

Structural protein

Question 40

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

Answer

Disulfide bond

Answer

Hydrogen bond

Answer

Peptide bond

Answer

Ionic bond

Question 41

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

Question 42

42. Which of the following enzymes breaks down proteins?

Answer

DNA polymerase

Question 43

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

Answer

Carbohydrates

Answer

Nucleic acids

Question 44

44. What is the primary structure of a protein?

Answer

3D conformation

Answer

Folding of protein

Answer

Interaction between polypeptides

Answer

Sequence of amino acids

Question 45

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

Answer

Peptide bond

Answer

Glycosidic bond

Answer

Ester bond

Answer

Hydrogen bond

Question 46

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

Answer

The enzyme slightly changes shape to bind the substrate

Answer

The enzyme and substrate fit perfectly like a lock and key

Answer

The enzyme permanently changes shape

Answer

The substrate is broken into multiple enzymes

Question 47

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

Answer

Its primary structure

Answer

Its amino acid composition only

Answer

Its solubility

Answer

Its DNA sequence

Question 48

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

Answer

Structural

Question 49

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

Answer

Metal ions

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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