FBISE · Class 9

Class 9 Biology MCQs: Molecular Biology

Practice chapter-wise MCQs with answers and explanations. Use the quiz mode for timed online tests.

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Quick revision

Class 9 Biology MCQs Molecular Biology are one of the fastest ways to improve your board exam performance — especially when you practice with purpose, revise weak concepts, and learn from explanations.

On Prepzy, you can practice 151 MCQs from “Molecular Biology” in Biology for FBISE. Each question is designed to mirror the style, wording, and concept-testing approach used in Pakistani board papers.

Use this chapter page to revise definitions, formulas, and key ideas, then attempt the MCQs in small sets. Track patterns in your mistakes: is it a concept gap, a calculation error, or a misread statement? Fixing the pattern is what raises your score.

If you’re preparing for matric / SSC Part exams, focus on understanding the concept first, then speed. MCQs reward clarity — not memorization. A clear concept turns into fast correct answers.

What to focus on

  • Primary focus: Molecular Biology concepts tested in Class 9 Biology
  • Practice with instant answer-checking to reduce repeated mistakes
  • Revise common definitions, units, and standard results before timed practice
  • Aim for accuracy first, then build speed with short quizzes

Study tips

  • Read the question stem first, then scan options for distractors (near-correct choices).
  • If the chapter is formula-heavy, write a mini-formula sheet and revise it before every attempt.
  • After each practice set, re-attempt only the wrong MCQs to convert weak areas into strengths.
  • Mix easy + medium MCQs for momentum, then finish with hard questions for exam readiness.

MCQs (sample)

Showing 25 questions from this chapter. For a full timed test, use “Start online test”.

  1. 1. What are biological molecules commonly referred to as?

    • Building blocks of life
    • Energy sources
    • Food materials
    • Waste products
    Answer & explanation

    Correct: Building blocks of life

    Biological molecules are referred to as the building blocks of life as they perform essential functions in living organisms.

  2. 2. What are the two main types of nucleic acids?

    • DNA and RNA
    • Proteins and Carbohydrates
    • Lipids and Steroids
    • Amino Acids and Enzymes
    Answer & explanation

    Correct: DNA and RNA

    The two main types of nucleic acids are Deoxyribonucleic Acid (DNA) and Ribonucleic Acid (RNA).

  3. 3. What percentage of the dry weight of a cell do proteins make up?

    • 55%
    • 20%
    • 75%
    • 40%
    Answer & explanation

    Correct: 55%

    Proteins make up around 55% of the dry weight of a cell.

  4. 4. What is the flow of biological information from DNA to RNA and then to proteins called?

    • Central dogma of life
    • Gene expression
    • Protein synthesis
    • Transcription
    Answer & explanation

    Correct: Central dogma of life

    The flow of biological information from DNA to RNA and then to proteins is known as the central dogma of molecular biology or 'central dogma of life'.

  5. 5. What are carbohydrates also known as?

    • Sugars
    • Fats
    • Proteins
    • Amino acids
    Answer & explanation

    Correct: Sugars

    Carbohydrates are also called sugars or saccharides due to their sweet taste.

  6. 6. What does biochemistry study?

    • Chemical compounds and processes in living organisms
    • Only chemical elements in nature
    • Only chemical reactions in laboratories
    • Chemical compounds in non-living organisms
    Answer & explanation

    Correct: Chemical compounds and processes in living organisms

    Biochemistry is the study of different chemical compounds and the processes within living organisms.

  7. 7. What is the structure of RNA compared to DNA?

    • Single stranded
    • Double stranded
    • Triple stranded
    • Circular
    Answer & explanation

    Correct: Single stranded

    RNA is a single stranded nucleic acid, unlike DNA which is double stranded.

  8. 8. What are carbohydrates classified based on?

    • Number of monomers
    • Taste
    • Color
    • Solubility
    Answer & explanation

    Correct: Number of monomers

    Carbohydrates are classified based on the number of monomers, i.e., saccharide units in the molecule.

  9. 9. What are lipids primarily characterized by?

    • Hydrophobic nature
    • Hydrophilic nature
    • Solubility in water
    • Heterogeneous structure
    Answer & explanation

    Correct: Hydrophobic nature

    Lipids are characterized by their hydrophobic nature, meaning they do not mix well with water.

  10. 10. What is heredity?

    • The transmission of characters from one generation to the next
    • The appearance of physical traits
    • The genetic modification of organisms
    • The study of DNA structure
    Answer & explanation

    Correct: The transmission of characters from one generation to the next

    Heredity is defined as the transmission of characters from one generation to the next, ensuring continuity of life.

  11. 11. What is the primary function of RNA?

    • To synthesize proteins by translation
    • To replicate DNA
    • To transport glucose
    • To initiate cellular respiration
    Answer & explanation

    Correct: To synthesize proteins by translation

    The primary function of RNA is to synthesize proteins by the process of translation.

  12. 12. Which of the following is NOT an example of an organic biomolecule?

    • Carbohydrates
    • Lipids
    • Water
    • Proteins
    Answer & explanation

    Correct: Water

    Water is an inorganic biomolecule, while carbohydrates, lipids, and proteins are organic biomolecules.

  13. 13. Which sugar is found in DNA?

    • Deoxyribose
    • Ribose
    • Glucose
    • Fructose
    Answer & explanation

    Correct: Deoxyribose

    The pentose sugar found in DNA is deoxyribose.

  14. 14. Which component is NOT typically part of the chemical composition of proteins?

    • N
    • P
    • Zn
    • Fe
    Answer & explanation

    Correct: Zn

    Proteins are composed of C, H, O, N, and sometimes P, S, and Fe, but not Zn.

  15. 15. What primarily determines the primary structure of any protein?

    • DNA
    • RNA
    • tRNA
    • Amino acids
    Answer & explanation

    Correct: DNA

    The primary structure of any protein is primarily determined by DNA.

  16. 16. What is the common carbohydrate produced by green plants through photosynthesis?

    • Galactose
    • Glucose
    • Fructose
    • Maltose
    Answer & explanation

    Correct: Glucose

    Glucose is the most common and simple carbohydrate produced in green plants by photosynthesis.

  17. 17. Which branch is mainly concerned with the interaction of biomolecules in the cells?

    • Biochemistry
    • Chemistry
    • Molecular biology
    • Cell biology
    Answer & explanation

    Correct: Molecular biology

    Molecular biology is the specialized branch of biochemistry focused on biomolecule interactions within cells.

  18. 18. Which sugar is present in RNA?

    • Ribose
    • Deoxyribose
    • Glucose
    • Fructose
    Answer & explanation

    Correct: Ribose

    The pentose sugar present in RNA is ribose, not deoxyribose as in DNA.

  19. 19. What is the simplest form of carbohydrates?

    • Disaccharides
    • Polysaccharides
    • Monosaccharides
    • Oligosaccharides
    Answer & explanation

    Correct: Monosaccharides

    Monosaccharides are the simplest form of carbohydrates.

  20. 20. Which of the following foods is a rich source of saturated fats?

    • Sunflower oil
    • Red meat
    • Soybean oil
    • Olive oil
    Answer & explanation

    Correct: Red meat

    Red meat is a rich source of saturated fats, while the others are sources of unsaturated fats.

  21. 21. What form do hereditary instructions take in organisms?

    • Huge DNA molecules
    • RNA strands
    • Proteins
    • Carbohydrates
    Answer & explanation

    Correct: Huge DNA molecules

    Hereditary instructions are carried in the form of huge DNA molecules.

  22. 22. Which type of RNA carries the message of DNA to the cytoplasm?

    • Ribosomal RNA (rRNA)
    • Transfer RNA (tRNA)
    • Messenger RNA (mRNA)
    • Nuclear RNA
    Answer & explanation

    Correct: Messenger RNA (mRNA)

    Messenger RNA (mRNA) carries the message of DNA from the nucleus to the cytoplasm.

  23. 23. Where are carbohydrates primarily located in a cell?

    • Nucleus
    • Cell wall
    • Cytoplasm
    • Golgi bodies
    Answer & explanation

    Correct: Cell wall

    Carbohydrates are primarily found in the cell wall, cell membrane, smooth endoplasmic reticulum, and Golgi bodies.

  24. 24. Which nitrogen base is unique to RNA?

    • Thymine
    • Cytosine
    • Uracil
    • Adenine
    Answer & explanation

    Correct: Uracil

    Uracil is a nitrogen base that is unique to RNA. DNA has thymine instead.

  25. 25. What are the building blocks of proteins?

    • Amino acids
    • Nucleotides
    • Fatty acids
    • Monosaccharides
    Answer & explanation

    Correct: Amino acids

    Amino acids are the building blocks or monomers of proteins.

FAQs

Are these Class 9 Biology MCQs Molecular Biology aligned with FBISE?

Yes. The MCQs are organized chapter-wise for FBISE and designed to match board exam patterns. If your teacher has added custom MCQs, they will also appear here.

How many MCQs should I practice from “Molecular Biology” each day?

A good daily target is 20–40 MCQs with full review of mistakes. If you’re short on time, do 15 MCQs but read explanations carefully.

What’s the best way to revise this chapter before an exam?

Revise the chapter summary, list your weak sub-topics, then practice MCQs in timed sets. Re-attempt wrong questions after a short break to lock in learning.

Can I take an online test for this chapter?

Yes. Start a chapter quiz to simulate an online test. Use it to improve speed and accuracy under time pressure.

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