biology class 9 chapter 6 biomolecules mcq with answers

chapter 6 biomolecules 


Section A: Introduction to Biomolecules

  1. Biomolecules are
    a) Inorganic molecules
    b) Organic molecules in living organisms
    c) Artificial substances
    d) Minerals only
    Ans: b

  2. Which of the following is not a biomolecule?
    a) Carbohydrate
    b) Protein
    c) Plastic
    d) Lipid
    Ans: c

  3. The most abundant biomolecule in the cell is
    a) Protein
    b) Lipid
    c) Carbohydrate
    d) Nucleic acid
    Ans: a

  4. Which element is not commonly found in biomolecules?
    a) Carbon
    b) Hydrogen
    c) Nitrogen
    d) Mercury
    Ans: d

  5. Biomolecules are primarily made up of:
    a) Carbon, hydrogen, oxygen, nitrogen
    b) Carbon, silver, gold
    c) Hydrogen, helium, neon
    d) Sodium, chlorine, iodine
    Ans: a

Section B: Carbohydrates

  1. The basic unit of carbohydrates is
    a) Amino acid
    b) Nucleotide
    c) Monosaccharide
    d) Fatty acid
    Ans: c

  2. Which is a monosaccharide?
    a) Glucose
    b) Sucrose
    c) Starch
    d) Cellulose
    Ans: a

  3. Sucrose is composed of
    a) Glucose + Galactose
    b) Glucose + Fructose
    c) Fructose + Maltose
    d) Maltose + Lactose
    Ans: b

  4. The polysaccharide stored in plants is
    a) Glycogen
    b) Starch
    c) Cellulose
    d) Glucose
    Ans: b

  5. Cellulose is present in:
    a) Animal cells
    b) Plant cell walls
    c) Human blood
    d) Muscles
    Ans: b

  6. Carbohydrates serve as:
    a) Structural molecules
    b) Main energy source
    c) Genetic material
    d) Hormones
    Ans: b

  7. Which sugar is found in milk?
    a) Glucose
    b) Lactose
    c) Sucrose
    d) Fructose
    Ans: b

  8. Glycogen is stored in:
    a) Blood
    b) Liver and muscles
    c) Kidney
    d) Brain
    Ans: b

  9. The test used to identify reducing sugars is
    a) Benedict’s test
    b) Iodine test
    c) Biuret test
    d) Sudan test
    Ans: a

  10. Iodine test gives a blue-black color with:
    a) Glucose
    b) Sucrose
    c) Starch
    d) Cellulose
    Ans: c

Section C: Proteins

  1. Proteins are made up of
    a) Sugars
    b) Nucleotides
    c) Amino acids
    d) Fatty acids
    Ans: c

  2. How many amino acids are commonly found in nature?
    a) 10
    b) 15
    c) 20
    d) 25
    Ans: c

  3. Enzymes are
    a) Lipids
    b) Proteins
    c) Carbohydrates
    d) Nucleic acids
    Ans: b

  4. Which of the following is a structural protein?
    a) Insulin
    b) Hemoglobin
    c) Keratin
    d) Pepsin
    Ans: c

  5. Hemoglobin is a:
    a) Lipid
    b) Vitamin
    c) Transport protein
    d) Hormone
    Ans: c

  6. Protein test in the lab is
    a) Benedict's
    b) Iodine
    c) Biuret
    d) Sudan III
    Ans: c

  7. The element found in protein but not in carbohydrate:
    a) Oxygen
    b) Hydrogen
    c) Nitrogen
    d) Carbon
    Ans: c

  8. Insulin controls:
    a) Protein digestion
    b) Blood sugar level
    c) Muscle contraction
    d) Nerve impulses
    Ans: b

  9. Which protein helps in blood clotting?
    a) Fibrinogen
    b) Hemoglobin
    c) Albumin
    d) Myosin
    Ans: a

  10. Myosin is a protein involved in:
    a) Digestion
    b) Muscle contraction
    c) Immunity
    d) Respiration
    Ans: b

Section D: Lipids

  1. Lipids are composed of:
    a) Glycerol and fatty acids
    b) Amino acids
    c) Nucleotides
    d) Sugars
    Ans: a

  2. Lipids are
    a) Soluble in water
    b) Insoluble in organic solvents
    c) Insoluble in water
    d) None of the above
    Ans: c

  3. Main function of lipids:
    a) Structural material
    b) Enzyme activity
    c) Long-term energy storage
    d) Hormone formation only
    Ans: c

  4. Which vitamin is fat-soluble?
    a) Vitamin B
    b) Vitamin C
    c) Vitamin D
    d) Vitamin H
    Ans: c

  5. Lipids give ______ kcal/g of energy.
    a) 2
    b) 4
    c) 9
    d) 7
    Ans: c

  6. Butter and ghee are examples of:
    a) Unsaturated fats
    b) Saturated fats
    c) Proteins
    d) Carbohydrates
    Ans: b

  7. Oils are rich in:
    a) Saturated fats
    b) Unsaturated fats
    c) Proteins
    d) Sugars
    Ans: b

  8. Which of these is not a function of fat?
    a) Insulation
    b) Cushioning of organs
    c) DNA replication
    d) Energy storage
    Ans: c

  9. Which test is used to detect fats?
    a) Biuret test
    b) Benedict’s test
    c) Sudan III test
    d) Iodine test
    Ans: c

  10. Waxes are a type of:
    a) Carbohydrate
    b) Protein
    c) Lipid
    d) Enzyme
    Ans: c

Section E: Nucleic Acids

  1. The building blocks of nucleic acids:
    a) Amino acids
    b) Nucleotides
    c) Monosaccharides
    d) Fatty acids
    Ans: b

  2. DNA stands for
    a) Deoxyribonucleic acid
    b) Deoxyribonucleic nitric acid
    c) Digital nucleic acid
    d) None of these
    Ans: a

  3. RNA contains
    a) Thymine
    b) Uracil
    c) Cytosine only
    d) Adenine only
    Ans: b

  4. Which sugar is present in RNA?
    a) Glucose
    b) Ribose
    c) Deoxyribose
    d) Sucrose
    Ans: b

  5. Genetic material in most organisms is
    a) Protein
    b) DNA
    c) Lipids
    d) Carbohydrate
    Ans: b

Section F: Nucleic Acids (Continued)

  1. The double-helix model of DNA was proposed by:
    a) Mendel and Darwin
    b) Watson and Crick
    c) Pasteur and Koch
    d) Franklin and Jenner
    Ans: b

  2. The base not found in DNA is
    a) Adenine
    b) Cytosine
    c) Thymine
    d) Uracil
    Ans: d

  3. DNA is mainly located in the:
    a) Cytoplasm
    b) Cell membrane
    c) Nucleus
    d) Mitochondria only
    Ans: c

  4. Function of RNA is
    a) Genetic storage
    b) Structural support
    c) Protein synthesis
    d) Energy production
    Ans: c

  5. Nucleotides are made of
    a) Sugar + Phosphate + Nitrogen base
    b) Fatty acid + Glycerol
    c) Glucose + Fructose
    d) Peptide + Water
    Ans: a

  6. In DNA, adenine pairs with:
    a) Thymine
    b) Cytosine
    c) Uracil
    d) Guanine
    Ans: a

  7. Which of these is single-stranded?
    a) DNA
    b) RNA
    c) Protein
    d) Lipid
    Ans: b

  8. DNA replication occurs in:
    a) Mitochondria
    b) Ribosome
    c) Nucleus
    d) Cytoplasm
    Ans: c

  9. Ribosomes are the sites of:
    a) Fat storage
    b) Protein synthesis
    c) DNA replication
    d) Energy production
    Ans: b

  10. Nucleic acids are polymers of:
    a) Fatty acids
    b) Nucleotides
    c) Sugars
    d) Amino acids
    Ans: b

Section G: Enzymes

  1. Enzymes are
    a) Fats
    b) Carbohydrates
    c) Proteins
    d) Vitamins
    Ans: c

  2. Enzymes act as
    a) Hormones
    b) Catalysts
    c) Reactants
    d) Substrates
    Ans: b

  3. The enzyme that digests starch is
    a) Pepsin
    b) Amylase
    c) Lipase
    d) Protease
    Ans: b

  4. Optimum temperature for most enzymes is
    a) 0°C
    b) 25°C
    c) 37°C
    d) 100°C
    Ans: c

  5. Pepsin digests:
    a) Carbohydrates
    b) Fats
    c) Proteins
    d) Nucleic acids
    Ans: c

  6. Lipase breaks down:
    a) Proteins
    b) Lipids
    c) Sugars
    d) Nucleotides
    Ans: b

  7. The pH for enzyme pepsin is
    a) Acidic
    b) Neutral
    c) Basic
    d) Alkaline
    Ans: a

  8. Enzyme activity is affected by:
    a) Temperature
    b) pH
    c) Substrate concentration
    d) All of these
    Ans: d

  9. Enzymes speed up reactions by:
    a) Raising activation energy
    b) Lowering activation energy
    c) Providing energy
    d) Inhibiting reaction
    Ans: b

  10. Lock and key model is related to
    a) Vitamins
    b) Enzymes
    c) Proteins
    d) Lipids
    Ans: b

Section H: Vitamins and Water

  1. Vitamins are
    a) Proteins
    b) Micronutrients
    c) Carbohydrates
    d) Polymers
    Ans: b

  2. Vitamin C is needed for:
    a) Vision
    b) Blood clotting
    c) Immune function
    d) Bone formation
    Ans: c

  3. Vitamin D helps in:
    a) Vision
    b) Calcium absorption
    c) Blood clotting
    d) Digestion
    Ans: b

  4. Deficiency of Vitamin A causes:
    a) Night blindness
    b) Rickets
    c) Scurvy
    d) Anemia
    Ans: a

  5. Water is a
    a) Nutrient
    b) Mineral
    c) Protein
    d) Biomolecule
    Ans: a

  6. Water is essential for:
    a) Metabolism
    b) Transport of nutrients
    c) Temperature regulation
    d) All of these
    Ans: d

  7. Water is lost through:
    a) Sweating
    b) Urination
    c) Breathing
    d) All of these
    Ans: d

  8. Vitamin K is needed for:
    a) Blood clotting
    b) Vision
    c) Bone growth
    d) Immune response
    Ans: a

  9. Which vitamin is not water-soluble?
    a) Vitamin C
    b) Vitamin B
    c) Vitamin D
    d) None
    Ans: c

  10. Most abundant component of a human cell is
    a) Protein
    b) Carbohydrate
    c) Water
    d) Lipid
    Ans: c

Section I: Other Questions

  1. Which biomolecule is the main component of the cell membrane?
    a) Protein
    b) Carbohydrate
    c) Lipid
    d) Nucleic acid
    Ans: c

  2. Antibodies are
    a) Carbohydrates
    b) Proteins
    c) Nucleic acids
    d) Lipids
    Ans: b

  3. Hormones like insulin are
    a) Proteins
    b) Carbohydrates
    c) Lipids
    d) Nucleic acids
    Ans: a

  4. Glucose is a:
    a) Monosaccharide
    b) Disaccharide
    c) Polysaccharide
    d) Protein
    Ans: a

  5. Which of the following provides quick energy?
    a) Lipids
    b) Carbohydrates
    c) Proteins
    d) Nucleic acids
    Ans: b

Section J: Match the Functions

  1. Protein synthesis occurs in:
    a) Ribosome
    b) Nucleus
    c) Mitochondria
    d) Golgi bodies
    Ans: a

  2. Glycogen in animals is stored in:
    a) Liver and muscles
    b) Brain and kidney
    c) Bones and skin
    d) Stomach and intestine
    Ans: a

  3. Which of the following stores genetic information?
    a) Protein
    b) RNA
    c) DNA
    d) Lipids
    Ans: c

  4. Which is NOT a biomolecule?
    a) Enzyme
    b) Glucose
    c) DNA
    d) Iron
    Ans: d

  5. Which biomolecule carries oxygen in blood?
    a) DNA
    b) Keratin
    c) Hemoglobin
    d) Insulin
    Ans: c

Section K: Higher-Order Thinking (Conceptual)

  1. Starch and glycogen differ in:
    a) Monomers
    b) Linkages
    c) Organism source
    d) All of these
    Ans: d

  2. An organic catalyst is
    a) Water
    b) Enzyme
    c) Vitamin
    d) Hormone
    Ans: b

  3. Which part of the nucleotide changes between DNA and RNA?
    a) Phosphate
    b) Sugar
    c) Nitrogen base
    d) Both b and c
    Ans: d

  4. In DNA, sugar is
    a) Ribose
    b) Glucose
    c) Deoxyribose
    d) Fructose
    Ans: c

  5. Lipid bilayer is part of:
    a) Nucleus
    b) Ribosome
    c) Cell membrane
    d) Vacuole
    Ans: c

Section L: True Application

  1. Which is a storage polysaccharide in animals?
    a) Cellulose
    b) Glycogen
    c) Starch
    d) Glucose
    Ans: b

  2. Enzyme specificity is due to:
    a) Shape
    b) Size
    c) Weight
    d) Color
    Ans: a

  3. Vitamin C deficiency leads to:
    a) Scurvy
    b) Rickets
    c) Pellagra
    d) Night blindness
    Ans: a

  4. Primary source of the body’s fuel:
    a) Lipids
    b) Carbohydrates
    c) Protein
    d) Minerals
    Ans: b

  5. Lipids are tested using
    a) Sudan III
    b) Benedict
    c) Iodine
    d) Biuret
    Ans: a

Section M: Revision Mix

  1. What is a polymer of amino acids?
    a) DNA
    b) Protein
    c) Carbohydrate
    d) Lipid
    Ans: b

  2. Structural carbohydrate in plants:
    a) Glycogen
    b) Glucose
    c) Cellulose
    d) Sucrose
    Ans: c

  3. RNA is mainly involved in:
    a) Replication
    b) Protein synthesis
    c) Energy production
    d) Digestion
    Ans: b

  4. Hormones can be:
    a) Proteins
    b) Lipids
    c) Both a and b
    d) None
    Ans: c

  5. The monomer of DNA is
    a) Amino acid
    b) Fatty acid
    c) Nucleotide
    d) Glucose
    Ans: c

  6. Nitrogen base not found in RNA:
    a) Adenine
    b) Thymine
    c) Uracil
    d) Cytosine
    Ans: b

  7. Which biomolecule is insoluble in water?
    a) Protein
    b) Carbohydrate
    c) Lipid
    d) Nucleic acid
    Ans: c

  8. What gives energy during long starvation?
    a) Protein
    b) Lipid
    c) DNA
    d) Vitamins
    Ans: b

  9. Building blocks of proteins:
    a) Monosaccharides
    b) Fatty acids
    c) Amino acids
    d) Nucleotides
    Ans: c

  10. Biomolecule that can replicate itself:
    a) Protein
    b) DNA
    c) Enzyme
    d) Lipid
    Ans: b


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