MDCAT XI Biology Biomolecules Online Test 2026

1. Amino acid with R group = CH₂OH:

2. If total RNA = 100 units, rRNA ≈

3. Fibrous protein:

4. Human body proteins and amino acids:

5. Insulin chains (α ; β):

6. Lipoproteins transport:

7. Human cells contain how many tRNA types?

8. Cerebrosides occur in ______ matter and ______ sheath:

9. Base pairs per DNA turn:

10. DNA → mRNA copying is called:

11. Distance between DNA helices:

12. Which of the following statements about phospholipids are correct?
i) They have one hydrophobic end and one hydrophilic end
ii) They are present in all living cells forming cell membrane
iii) They are related to cell permeability regulation
iv) They are energy storage molecules

13. Purine bases except:

14. Complementary strand of 5′-ATGC-3′:

15. Arrange the RNA types in order of their percentage in total cellular RNA (highest to lowest):
i) mRNA
ii) tRNA
iii) rRNA

16. Esters of long-chain alcohol and fatty acids are:

17. Lipids involved in inflammation and pain:

18. Single-stranded, 70–90 nucleotides, anticodon, transfers amino acids:

19. 16 kg fat stores how much energy?

20. Correct statement about acylglycerol:

21. Correct statement about triglyceride:

22. Mutation alters codon sequence. Which RNA is affected?

23. Most abundant RNA in cell:

24. tRNA is characterized by:

25. DNA nucleotides are linked by ______ bonds; bases by ______ bonds.

26. Correct statement about RNA:

27. Correct RNA base pair:

28. Which statement is true?

29. Which nucleic acid contains ribose and thymine?

30. Base present in RNA but absent in DNA:

31. Which lipid is amphipathic?

32. Which carbohydrate has β-1,4 bonds and is digestible by humans?

33. A carbohydrate gives no color with iodine. Which is it?

34. Which statement about proteins is correct?

35. Choose the correct pair:

36. Match the following
a. Cellulose
b. Starch
c. Glycogen

1.Storage polysaccharide
2.Structural polysaccharide
3.Animal storage

37. Which molecule differs due to presence of nitrogen?

38. Prostaglandins are involved in:

39. All amino acids have the same basic structure except their:

40. An athlete requires maximum energy per gram. Which molecule should dominate his diet?

41. Sucrose is composed of which two monosaccharides?

42. Which class of proteins is spherical, water-soluble, and often enzymatic?

43. What is the basic repeating unit of a terpenoid lipid?

44. What key structural feature distinguishes steroids from other lipids?

45. What type of bond holds complementary base pairs together in DNA?

46. During the process of __________, water is removed to form a bond, whereas in __________, water is added to break a bond.

47. The specific sequence of amino acids in a protein is critical for its function. What is the primary determinant of this specific amino acid arrangement?

48. Which property of water is most directly responsible for its ability to moderate temperature in organisms and coastal environments?

49. A scientist observes that a long chain of glucose molecules breaks down into individual glucose units upon the addition of water and a specific enzyme. What is the name of this reaction?

50. Which of the following correctly pairs a macromolecule's monomer with the type of linkage that connects them?