In this article, we are going to give you the FPSC Biology MCQs, These are the Biology Mcqs that are collected from various sources such as NTS Past papers, FPSC past papers, and entrance test of medical universities. These FPSC Biology MCQs will help the students to get higher marks in biology the subject.

Biology MCQs

FPSC Biology MCQs

1. Purines and pyrimidines are in equal ration in DNA. It was indicated by_______________?

A. F.Miescher
B. Chargaff
C. Watson & Crick
D. Harshay & Chase

2. Chlorophyll is a/an _____ molecule?

A. Inorganic
B. Cationic
C. Anionic
D. Organic

3. Ribonucleo-protein particles are the name of__________?

B. Nucleus
C. Eukaryotic ribosomes

4. Lock and Key model was proposed by______________?

A. Emil Fischer
B. Koshland
C. Robin Williams
D. Rudolph Virchow

5. Which step causes activation of catalytic site of an enzyme__________________?

A. Change in pH of the surroundings.
B. Formation of Enzyme Sustrate complex.
C. Change in the charge of the active site.
D. Change in temperature

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6. Amoeboid movements and movement of cyclosis is due to_________?

A. Microfilaments
B. Microtubules
C. Intermediate filaments
D. Cytoskeleton

7. Enzymes __________________ the activation energy of a chemical reaction?

A. Increases
B. Decreases
C. Does not-effect
D. Increases or decreases depending upon individual enzyme

8. Which one forms the raw material for coenzymes_______________________?

A. Vitamins
B. Carbohydrates
C. Proteins
D. Metals

9. Proteins and lipids are converted into glycolipids and glycoproteins by adding carbohydrates by___________?

A. Ribosomes
B. Cytoplasm
C. Golgi apparatus
D. Endoplasmic reticulum

10. Biological molecules (proteins) which catalyze a biochemical reaction and remain unchanged after completion of reaction are called_____________________?

A. Cofactor
B. Coenzymes
C. Activator
D. Enzymes


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11. In which of the following location enzymes controlling cellular respiration are present____________?

A. Nucleus
B. Chlorophast
C. Milochondria
D. Ribosome

12. In golgi apparatus the maturing face is____________?

A. Biconcave
B. Convex
C. Spherical
D. Concave

13. A cofactor made of inorganic ion which is detachable is called__________________?

A. Prosthetic group
B. Coenzyme
C. Activator
D. Cofactor

14. An activated enzyme consisting of polypeptide chain and a cofactor is called_______________?

A. Apoenzyme
B. Holoenzyme
C. Activated enzyme
D. Both b and c

15. Centrioles are composed of ________ triplets of microtubules.

A. 3
B. 9
C. 10
D. 15

16. Which statement about enzyme is incorrect_________________?

A. Some of them consist solely of protein with no non protein part.
B. They catalyze a chemical reaction without being utilized.
C. All enzymes are fibrous Proteins.
D. They without their cofactor are called apoenzyme.

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17. A three dimensional activity bearing a specific charge by which the enzyme reacts with its substrate is called_________________?

A. Active site
B. Binding site
C. Catalytic site
D. Allosteric site

18. Cellular organelles related with H2O2 are___________?

A. Glyoxisomes
B. Lysosomes
C. Peroxisomes
D. Ribosomes

19. If more substrate to already occurring enzymatic reaction is added more enzyme activity is seen because_____________?

A. There is probably more substrate present than there is enzyme.
B. There is probably more enzayme available than there is substrate.
C. There is probably more product present than there is either substrate or enzyme.
D. The enzyme substrate complex is probably failing to form during the reaction

20. A group of ribosomes attached to mRNA is known as___________?

A. Polymer
B. Polypeptide
C. Polysomes
D. Monomer

21. The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect_________________?

A. Increase in enzyme molecule increases the available active sites.
B. This relation is for unlimited time period with unlimited enzyme concentration
C. If the concentration is doubled the rate will become two fold.
D. None of these.

22. Which statement is incorrect about Lock and Key Model________________?

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A. Specific enzyme can transform only a specific substrate
B. Active site of an enzyme is a non-flexible structure
C. Active site does not change before during or even after the reaction
D. It explains the mechanism of every chemical reaction

23. If the concentration of enzyme is kept constant and amount of substrate is increased a point is reached where increase in substrates concentration does not affect the reaction rate because of____________________?

A. Enzymes get denatured at higher substrate conc
B. Rate of reaction is indirectly proportional to substrate concentration at this point
C. All the active sites on enzyme molecule are occupied
D. None of these

24. The active site of an enzyme______________?

A. Never changes
B. Forms no chemical bond with substrate
C. Determined by structure and the specificity of the enzyme
D. They are non-specific in their action

25. Factory of Ribosomal synthesis is__________?

A. Cytoplasm
B. Nucleus
C. Nucleolus
D. Endoplasmic reticulum

26. If more substrate to already occurring enzymatic reaction is added and there is no effect on the rate of the reaction what is the form given to this situation___________?

A. Saturation
B. Denaturation
C. Composition
D. Inhibition

27. Who opposed the idea the cell is an empty space bounded by thick wall?

A. Lorenz Oken
B. Schwann
C. Robert Brown
D. Rudolph Virchow

28. Extreme change in pH results in______________?

A. Change in ionization of amino acids at the active site of the enzyme
B. Change in the ionization of the substrate
C. Denaturation of the enzyme
D. Increase in the reaction rate

29. Resolution power of a compound microscope is___________?

A. 2.0 m
B. 2-4 A
C. 24 m
D. 24 A

29. Excessive increase in temperature of medium causes the enzyme molecule to____________?

A. Activate
B. Unaffected
C. Denatured
D. None of these

30. If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction____________________?

A. increase in concentration of enzyme
B. increase in concentration of substrate
C. increase in pH
D. increase in temperature

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31. In cell fractionation various components of cells including its organelles can be isolated in different layers depending upon____________?

A. Their physical properties like size & weight.
B. Physical properties of the medium like its density.
C. Their electrical properties like their charges
D. Both a and b

32. The structure of an enzyme is altered by____________?

A. Irreversible inhibitor
B. Reversible inhibitor
C. Competitive inhibitor
D. Non-competitive inhibitor

33. Malonic acid is an example of____________?

A. Irreversible inhibitor
B. Reversible inhibitor
C. Competitive inhibitor
D. Non-competitive inhibitor

34. Magnifying power of electron microscope as compared to eye is____________?

A. 500 X
B. 250000X
C. 500000X
D. 250X

35. Inhibitors which block the enzyme by forming weak bond are called___________?

A. Competitive inhibitors.
B. Non-competitive inhibitors
C. Irreversible inhibitors.
D. Both a and b

36. Which of the statement about cell membrane is not true?

A. It contains protein molecules embedded in lipid bilayer
B. It is a differentially permeable membrane.
C. It contains charged pores thus ions being charged particles cross cell membrane much easier than neutral particles.
D. It may get in folded to engulf solid or liquid material.

37. A substance which binds at the active site of the enzyme but does not result in the formation of the products is called________________?

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A. Irreversible inhibitor
B. Reversible inhibitor
C. Competitive inhibitor
D. Non-competitive inhibitor

38. A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called_______________?

A. Co-enzyme
B. Blocker
C. Inhibitor
D. Cofactor

39. Optimal temperature of enzymes present in human body is_____________?

A. 27C
B. 37C
C. 47C
D. 30C

40. Strengthening material of prokaryotic cell wall is__________?

A. Cellulose
B. Chitin
C. Inorganic salts silica waxes and ligin
D. Peptidoglycan or Murein.

41. Spherical or tubular membranes which separate the material present in endoplasmic reticulum from that of cytoplasmic material are called__________?

A. Cytosol
B. Cisternae
C. Polysomes
D. Cristae

42. What is not the function of endoplasmic reticulum?

A. Nerve impulse conduction
B. Transport of material
C. Mechanical support
D. Synthesis of conjugated molecules

43. 60S and 40S subunit combine to form ________ particle.

A. 100 S
B. 90 S
C. 80 S
D. 70 S

44. Pancreas produces secretory granules that help in digestion. These granules after passing through endoplasmic reticulum are pinched off from ________ surface of Golgi apparatus:

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A. Forming face
B. Maturating face
C. Any of them
D. None of these

45. Which of the following statement is incorrect about Glyoxisomes?

A. They contain enzymes which help in conversion of fatty acids into carbohydrate
B. They are abundant in soya beans but absent in pea.
C. They are present throughout life of a plant and provide them whth energy through Glyoxylate cycle.
D. They are single membranous organelles

46. Ribosomes + m-RNA?

A. Polysome
B. Phlosome
C. Polosome
D. None of these

47. Which of the following impart a red colour to Rose petals?

A. Chloroplast
B. Chlorophyll
C. Chromoplast
D. Leucoplast

48. During digesting the phagocytosed food particles vesicles formed from fusion of phagocytic vacuole with the enzymes secreted by Golgi apparantus are called_______?

A. Lysosomes
B. Primary lysosomes
C. Secondary lysosomes
D. Food vacuole

49. The bond formed when two or more atoms complete their electron shells by sharing electrons is called_____________?

A. Ionic bond
B. Hydrogen bond
C. Covalent bond
D. Electrovalent bond

50. Which one is the basic element of organic compounds _________________?

A. Oxygen
B. Hydrogen
C. Sulphur
D. Carbon

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