50 Most Important NEET PYQs of Chapter 9: Biomolecules – Part 2 (Q26–50)

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🧬 50 Most Important NEET PYQs of Chapter 9: Biomolecules – Part 2 (Q26–50)

26. Which of the following is an example of an enzyme that helps in the digestion of proteins?
A) Amylase
B) Lipase
C) Trypsin
D) Lactase
✅ Answer: C) Trypsin
Explanation: Trypsin is a proteolytic enzyme that breaks down proteins into smaller peptides during digestion.

27. Which type of lipid is most abundant in the cell membrane?
A) Phospholipids
B) Cholesterol
C) Triglycerides
D) Waxes
✅ Answer: A) Phospholipids
Explanation: Phospholipids are the primary component of the cell membrane, forming the bilayer structure essential for membrane function.

28. What is the storage form of glucose in plants?
A) Glycogen
B) Starch
C) Cellulose
D) Chitin
✅ Answer: B) Starch
Explanation: Starch is the storage form of glucose in plants, which is used for energy when required.

29. The primary structure of a protein is determined by:
A) The sequence of amino acids
B) The shape of the protein
C) The sequence of nucleotides
D) The hydrogen bonds
✅ Answer: A) The sequence of amino acids
Explanation: The primary structure of a protein refers to the specific sequence of amino acids in its polypeptide chain.

30. Which of the following compounds is used as a source of energy for muscles during exercise?
A) Fatty acids
B) Glucose
C) Amino acids
D) Nucleotides
✅ Answer: B) Glucose
Explanation: During exercise, glucose is used by muscles as a quick source of energy.

31. The basic unit of a nucleic acid is:
A) Amino acid
B) Nucleotide
C) Fatty acid
D) Glucose
✅ Answer: B) Nucleotide
Explanation: Nucleic acids, such as DNA and RNA, are composed of repeating units called nucleotides.

32. Which of the following is true about enzymes?
A) Enzymes increase the activation energy of a reaction.
B) Enzymes are used up in the reaction.
C) Enzymes are specific to their substrates.
D) Enzymes work best at high temperatures.
✅ Answer: C) Enzymes are specific to their substrates
Explanation: Enzymes are highly specific and catalyze reactions for specific substrates only.

33. Which of the following is a polysaccharide found in animal cells?
A) Starch
B) Cellulose
C) Glycogen
D) Chitin
✅ Answer: C) Glycogen
Explanation: Glycogen is a polysaccharide used to store energy in animal cells, primarily in the liver and muscles.

34. Which of the following statements is true regarding lipids?
A) Lipids are water-soluble molecules.
B) Lipids are primarily composed of proteins.
C) Lipids are hydrophobic and insoluble in water.
D) Lipids serve as enzymes in biochemical reactions.
✅ Answer: C) Lipids are hydrophobic and insoluble in water
Explanation: Lipids are non-polar molecules, making them insoluble in water. They include fats, oils, and phospholipids.

35. Which of the following is a function of nucleic acids?
A) Providing energy
B) Storing genetic information
C) Enzyme catalysis
D) Transporting molecules
✅ Answer: B) Storing genetic information
Explanation: Nucleic acids like DNA and RNA store and transmit genetic information within cells.

36. The bond between two amino acids in a polypeptide is called a:
A) Peptide bond
B) Ionic bond
C) Hydrogen bond
D) Disulfide bond
✅ Answer: A) Peptide bond
Explanation: Amino acids are linked by peptide bonds to form polypeptides (proteins).

37. Which of the following vitamins is fat-soluble?
A) Vitamin C
B) Vitamin B
C) Vitamin A
D) Vitamin B12
✅ Answer: C) Vitamin A
Explanation: Vitamin A is fat-soluble and is important for vision and immune function.

38. The most common energy currency of the cell is:
A) NADH
B) FADH2
C) ATP
D) Glucose
✅ Answer: C) ATP
Explanation: ATP (adenosine triphosphate) is the primary energy carrier in cells.

39. Which of the following structures is not involved in the synthesis of proteins?
A) Ribosome
B) Nucleus
C) Mitochondria
D) Golgi body
✅ Answer: C) Mitochondria
Explanation: Mitochondria are involved in energy production (ATP synthesis), not protein synthesis. Ribosomes and the nucleus are involved in protein synthesis.

40. Which of the following is a function of proteins?
A) Providing insulation
B) Serving as a source of long-term energy
C) Catalyzing biochemical reactions
D) Storing genetic information
✅ Answer: C) Catalyzing biochemical reactions
Explanation: Proteins, specifically enzymes, catalyze biochemical reactions in cells.

41. The secondary structure of a protein is stabilized by:
A) Ionic bonds
B) Peptide bonds
C) Hydrogen bonds
D) Disulfide bonds
✅ Answer: C) Hydrogen bonds
Explanation: The secondary structure of proteins (alpha-helices and beta-pleated sheets) is stabilized by hydrogen bonds.

42. The process by which RNA is synthesized from a DNA template is called:
A) Transcription
B) Translation
C) Replication
D) Translocation
✅ Answer: A) Transcription
Explanation: Transcription is the process where an RNA molecule is synthesized from a DNA template.

43. Which of the following is the most important source of energy for cellular activities?
A) Proteins
B) Carbohydrates
C) Lipids
D) Nucleic acids
✅ Answer: B) Carbohydrates
Explanation: Carbohydrates, especially glucose, are the primary energy source for cellular activities.

44. Which of the following is not a type of RNA?
A) mRNA
B) rRNA
C) tRNA
D) dRNA
✅ Answer: D) dRNA
Explanation: There is no such thing as dRNA. The types of RNA are mRNA, rRNA, and tRNA.

45. The process of converting glucose to pyruvate is called:
A) Glycolysis
B) Krebs cycle
C) Fermentation
D) Gluconeogenesis
✅ Answer: A) Glycolysis
Explanation: Glycolysis is the metabolic pathway that converts glucose to pyruvate, releasing energy.

46. Which of the following is true about enzymes?
A) They are always consumed in the reaction.
B) They increase the activation energy of a reaction.
C) They lower the activation energy of a reaction.
D) They are only active in low temperatures.
✅ Answer: C) They lower the activation energy of a reaction
Explanation: Enzymes lower the activation energy, allowing reactions to occur more easily.

47. The final product of the breakdown of glucose in aerobic respiration is:
A) Lactic acid
B) Pyruvate
C) Water
D) Carbon dioxide and water
✅ Answer: D) Carbon dioxide and water
Explanation: In aerobic respiration, glucose is completely oxidized to produce carbon dioxide, water, and energy (ATP).

48. Which of the following proteins is involved in muscle contraction?
A) Myosin
B) Insulin
C) Hemoglobin
D) Collagen
✅ Answer: A) Myosin
Explanation: Myosin is a motor protein involved in muscle contraction, working with actin.

49. The basic unit of glycogen is:
A) Glucose
B) Fructose
C) Galactose
D) Sucrose
✅ Answer: A) Glucose
Explanation: Glycogen is a polysaccharide made up of glucose units linked together.

50. Which of the following is true about the structure of DNA?
A) It consists of two complementary strands wound into a triple helix.
B) It is a single-stranded molecule.
C) It is made of a double helix structure with complementary base pairs.
D) It has a circular structure.
✅ Answer: C) It is made of a double helix structure with complementary base pairs
Explanation: DNA has a double helix structure with two complementary strands, where adenine pairs with thymine, and cytosine pairs with guanine.


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