Skip to main content

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

Labels:

Comments

Post a Comment

Popular posts from this blog

Biology Class 9th Quiz

 Biology Class 9 Quiz – 10 Important MCQs with Answers Test your knowledge with this Biology Class 9 quiz featuring 10 important multiple-choice questions (MCQs) with correct answers and explanations. Perfect for exam preparation and self-assessment. Biology Class 9 Quiz Biology Class 9 - Quiz (10 MCQs) 1. The basic unit of life is: Tissue Cell Organ Organ system 2. Which organelle is known as the powerhouse of the cell? Ribosome Mitochondria Nucleus Golgi apparatus 3. Photosynthesis takes place in which cell organelle? Mitochondria Ribosome Chloroplast Endoplasmic Reticulum 4. Which tissue connects muscles to bones? Tendon Ligament Cartilage Areolar tissue ...
Post a Comment
Read more

What is plasmodesmata?

Plasmodesmata: The Secret Communication Highways in Plant Cells Introduction Even though plant cells are enclosed in rigid walls, how do they communicate with one another? The answer lies in microscopic channels called plasmodesmata. These tiny structures act like bridges, allowing cells to share nutrients, signals, and even genetic information. In this article, we’ll explore what plasmodesmata are, how they are structured, their function, and why they’re essential for plant survival. This comprehensive guide will provide a straightforward yet insightful breakdown of everything, making it useful for biology students, educators, or just curious minds. What Are Plasmodesmata? Plasmodesmata (singular: plasmodesma) are microscopic cytoplasmic channels that pass through the cell walls of plant cells. These channels connect the cytoplasm of one cell directly to another, forming a continuous network throughout the plant tissue. They are essential for intercellular communication, much ...
Post a Comment
Read more

1st year biology chapter 1 notes

Chapter 1: Introduction to Biology—Short Questions with Answers Basic Concepts Define biology. Biology is the scientific study of life and living organisms. What is meant by zoology? Zoology is the branch of biology that deals with the study of animals. Write a definition of botany. Botany is the branch of biology concerned with the study of plants. What is microbiology? Microbiology is the study of microscopic organisms such as bacteria, viruses, and fungi. Name three major divisions of biology. Zoology, Botany, and Microbiology. Branches of Biology What is morphology? Morphology is the study of the form and structure of organisms. Define physiology. Physiology deals with the functions and processes of living organisms and their parts. Define anatomy. Anatomy is the study of the internal structure of organisms. What is taxonomy? Taxonomy is the science of naming, classifying, and organizing organisms. What do you mean by embryology? Embryol...
Post a Comment
Read more