Last Updated on June 7, 2025 by XAM CONTENT
To succeed in Class 11 Biology exams, a strong grasp of Chapter 9 – Biomolecules is essential. Our comprehensive collection of chapterwise MCQ questions with answers for Class 11 Biology is designed according to the latest syllabus and exam guidelines, ensuring targeted preparation and better performance. It is a part of MCQ Questions for CBSE Class 11 Biology Series.
These multiple-choice questions will help you assess your knowledge, improve accuracy, and boost confidence for your exams. Whether you are preparing for school tests, online tests or competitive exams, these Biomolecules MCQs will strengthen your conceptual clarity.
| Chapter | Biomolecules |
| Book | Biology for Class 11 |
| Type of Questions | MCQ Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 11 |
| Subject | Biology |
| Useful for | Class 11 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 11 Biology Chapterwise MCQ Questions |
MCQ Questions on Biomolecules Class 11 Biology (PDF Download)
MCQs
Q1. Which biomolecule does not follow the typical polymer formation process by dehydration synthesis?
(a) Proteins
(b) Carbohydrates
(c) Lipids
(d) Nucleic acids
Show Answer
Answer: (c)
Explanation: Lipids are not true polymers and do not form by typical dehydration reactions like other biomolecules.
Q2. Which one of the following pairs is mismatched?
(a) DNA – Genetic information
(b) RNA – Protein synthesis
(c) ATP – Energy currency
(d) Enzyme – Structural protein
Show Answer
Answer: (d)
Explanation: Enzymes are functional, catalytic proteins, not structural.
Q3. Which carbohydrate is stored in plant cells and is insoluble in water?
(a) Glucose
(b) Sucrose
(c) Cellulose
(d) Starch
Show Answer
Answer: (d)
Explanation: Starch is stored in an insoluble form in plant cells to avoid osmotic issues.
Q4. What feature allows enzymes to lower activation energy?
(a) Their size
(b) Their ability to break bonds
(c) Their active site specificity
(d) Their solubility in water
Show Answer
Answer: (c)
Explanation: The active site of enzymes precisely fits the substrate, facilitating reactions by lowering activation energy.
Q5. Which of the following contains nitrogen but is not a protein?
(a) Urea
(b) Albumin
(c) Keratin
(d) Hemoglobin
Show Answer
Answer: (a)
Explanation: Urea is a nitrogenous waste product and is not a protein.
Q6. Which is the most abundant protein in the human body?
(a) Keratin
(b) Hemoglobin
(c) Collagen
(d) Myosin
Show Answer
Answer: (c)
Explanation: Collagen is the most abundant protein, especially in connective tissues.
Q7. Which of the following is not a reducing sugar?
(a) Fructose
(b) Lactose
(c) Sucrose
(d) Maltose
Show Answer
Answer: (c)
Explanation: Sucrose is a non-reducing sugar because the glycosidic bond prevents free aldehyde or keto group.
Q8. Which bond links two amino acids in a protein?
(a) Glycosidic bond
(b) Peptide bond
(c) Phosphodiester bond
(d) Disulfide bond
Show Answer
Answer: (b)
Explanation: Peptide bonds form between the amino group of one amino acid and the carboxyl group of another.
Q9. Which biomolecule plays a structural role in plant cell walls?
(a) Chitin
(b) Cellulose
(c) Glycogen
(d) Amylose
Show Answer
Answer: (b)
Explanation: Cellulose is a structural polysaccharide in plant cell walls.
Q10. Which vitamin is synthesized by intestinal bacteria?
(a) Vitamin C
(b) Vitamin K
(c) Vitamin A
(d) Vitamin D
Show Answer
Answer: (b)
Explanation: Vitamin K is produced by gut microbiota and plays a key role in blood clotting.
Q11. Which of the following macromolecules can act as both structural and catalytic components in living systems?
(a) Lipids
(b) Carbohydrates
(c) Proteins
(d) Nucleic acids
Show Answer
Answer: (c)
Explanation: Proteins can be structural (collagen) and catalytic (enzymes).
Q12. Which one of these lipids acts as a precursor for steroid hormones?
(a) Triglyceride
(b) Cholesterol
(c) Glycolipid
(d) Phospholipid
Show Answer
Answer: (b)
Explanation: Cholesterol is a precursor for all steroid hormones.
Q13. Denaturation of proteins affects which structural level first?
(a) Primary
(b) Secondary
(c) Tertiary
(d) Quaternary
Show Answer
Answer: (c)
Explanation: Denaturation disrupts hydrogen bonds affecting the tertiary structure primarily.
Q14. Which compound is used to detect the presence of starch?
(a) Benedict’s reagent
(b) Biuret reagent
(c) Iodine solution
(d) Sudan III
Show Answer
Answer: (c)
Explanation: Iodine solution turns blue-black in the presence of starch.
Q15. Which property makes water essential in biochemical reactions?
(a) High density
(b) Low viscosity
(c) Solvent nature
(d) Non-polarity
Show Answer
Answer: (c)
Explanation: Water is a universal solvent, facilitating biochemical reactions.
Q16. Which of these is a conjugated protein?
(a) Albumin
(b) Pepsin
(c) Haemoglobin
(d) Insulin
Show Answer
Answer: (c)
Explanation: Haemoglobin is a conjugated protein with a heme (iron) group.
Q17. Which method is commonly used for protein separation based on molecular size?
(a) Electrophoresis
(b) Chromatography
(c) Centrifugation
(d) Dialysis
Show Answer
Answer: (a)
Explanation: Electrophoresis separates proteins based on their size and charge.
Q18. Which biomolecule is not involved in energy storage?
(a) ATP
(b) Glycogen
(c) Cellulose
(d) Starch
Show Answer
Answer: (c)
Explanation: Cellulose is structural, not a storage molecule.
Q19. Which of the following is an example of a disaccharide?
(a) Glucose
(b) Fructose
(c) Sucrose
(d) Galactose
Show Answer
Answer: (c)
Explanation: Sucrose is a disaccharide composed of glucose and fructose.
Q20. Which class of enzymes catalyzes oxidation-reduction reactions?
(a) Transferases
(b) Oxidoreductases
(c) Hydrolases
(d) Ligases
Show Answer
Answer: (b)
Explanation: Oxidoreductases catalyze redox reactions by transferring electrons.
We hope the given mcq questions with Answers for Biomolecules Class 11 helps you in your learning.
Also check
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Topics from which mcq questions may be asked
- Carbohydrates
- Proteins and enzymes
- DNA, RNA, lipids
Molecules make life possible—from DNA to enzymes, everything has a role.
Frequently Asked Questions (FAQs) on Biomolecules MCQ Questions
Q1: What is the best way to prepare for Class 11 Biology MCQ questions?
A1: The best way is to study NCERT concepts thoroughly, practice topicwise MCQs regularly. Solving previous year MCQs and mock tests can boost accuracy and speed.
Q2: Are NCERT questions enough for Class 11 Biology MCQ-based exams?
A2: NCERT forms the base for all CBSE Physics MCQs. However, for better preparation, students should solve additional MCQs from reference books and practice HOTS and competency-based questions to develop better understanding.
Q3: Where can I find chapterwise Class 11 Biology MCQ questions with answers?
A3: You can find chapterwise MCQ questions with answers and detailed explanations on trusted educational platforms like xamcontent.com and physicsgurukul.com. These cover both basic and advanced-level questions.
Q4: Do CBSE Class 11 exams include MCQs?
A4: Yes, as per the latest CBSE exam pattern, objective questions, including MCQs, are part of the final exam paper. MCQs test conceptual understanding and application skills.
Q5: How to score high in Class 11 Biology MCQs?
A5: To score high, understand the theory from NCERT, solve a variety of MCQs (basic and conceptual), and regularly revise theory. Avoid guesswork and focus on time management during tests.
