100 Important Biology Solved MCQ’s

By: Prof. Dr. Fazal Rehman | Last updated: May 13, 2025

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1. : Which of the following statement is incorrect regarding enzyme?



2. : ________ coined the term CELL:



3. : _________ has the enzymes controlling respiration:



4. : Who hypothesized that new cells are formed from the previously existing living cell?



5. : What is an activated enzyme consisting of a polypeptide and a cofactor called?



6. : What is the resolution power of a compound microscope?



7. : _____________ forms the raw material for coenzymes:



8. : Which of the following is the first layer of the cell wall formed?



9. : The activation energy of a chemical reaction ____________ by enzymes:



10. : ___________ has cellulose as the major component:



11. : __________ is a cofactor made of inorganic ion which is detachable:



12. : ___________ is the factory of ribosomal synthesis:



13. : ______________ is a three-dimensional cavity bearing a specific charge by which the enzyme reacts with its substrate:



14. : What are autophagosomes?



15. : Which of the following step causes the activation of the catalytic site of an enzyme?



16. : What is the percentage of proteins in the cell membrane?



17. : Who proposed Lock and Key model?



18. : Centrioles are composed of ______ triplets of microtubules:



19. : Which of the following is incorrect about Lock and Key model?



20. : Ribosomes + mRNA:



21. : Which statement is incorrect in this respect: The rate of a reaction is directly proportional to the concentration of an enzyme?



22. : The maturing face in Golgi apparatus is:



23. : If the concentration of the enzyme is kept constant, and the amount of substrate is increased, a point is reached where an increase in substrate’s concentration doesn’t affect the reaction rate because of:



24. : Chlorophyll is a/an __________ molecule:



25. : If more substrate to the already occurring enzymatic reaction is added, more enzyme activity is seen because:



26. : Where are ribosomes assembled?



27. : 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?



28. : __________ is not present in mitochondria:



29. : The active site of an enzyme:



30. : Chlorophyll molecule contains _______ as central metal ion:



31. : Excessive increase in temperature of the medium causes the enzyme molecule to:



32. : ___________ impart a red colour to Rose petals:



33. : The extreme change in pH leads to:



34. : In an RBC, number of nuclear pores are:



35. : In a human body, optimal temperature of enzymes present are:



36. : Solanum tuberosum is the scientific name of __________:



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



38. : Allium cepa is the scientific name of __________:



39. : Inhibitors which block the enzyme by forming a weak bond are known as:



40. : Who proposed five kingdom classification?



41. : A substance which binds at the active site of the enzyme but doesn’t result in the formation of the products is called:



42. : From which kingdom Amoeba belongs to?



43. : The structure of an enzyme is altered by ___________:



44. : Kingdom Monera is also known as:



45. : Malonic acid is an example of ___________:



46. What is the coat that encloses RNA or DNA of viruses?



47. If enzyme concentration is low compared to the substrate, and pH and temperature values meet the requirement, which of the following will increase the rate of reaction?



48. Who discovered the Vaccine?



49. ___________ is not present in all the bacteria:



50. What is the size of the smallest virus?



51. How many postulates does the Germ Theory of Disease have?



52. Protein subunits of the capsid, called capsomeres, are characteristic of each virus. Their number in Herpes virus is:



53. The first bacterium isolated was _________:



54. What is the size of the poxvirus?



55. ___________ bacteria are rigid, spiral, and thick:



56. How many times are viruses smaller than bacteria?



57. What is a group of 8 cocci called?



58. What is a virion?



59. _________ bacteria do not have flagella commonly:



60. Temperate phage may exist as ________:



61. From where do flagella originate?



62. ___________ is an RNA virus:



63. Cell wall is absent in ___________:



64. Which is the smallest known virus?



65. Gram-positive bacteria appear:



66. Hepatitis A mode of transmission is:



67. __________ is the common waste material in bacteria:



68. For which no preventive vaccine is available?



69. E. Coli is an example of __________:



70. How many phyla does Kingdom Protista include?



71. Spirochete is an example of ___________:



72. Which has glassy shells?



73. The vaccine against anthrax was developed by:



74. Mostly photosynthesis on earth is carried by:



75. Cyanobacteria is reproduced by:



76. The second name of brown algae is:



77. : What is incorrect about plants?



78. : Another name of golden algae is:



79. : What is the reason Bryophytes are called amphibians of the plant world?



80. : Most of the dinoflagellates are ___________:



81. : In which sub-class are Hornworts included?



82. : The main energy stores in chlorophytes are:



83. : Horsetails are included in ____________ class:



84. : Spores produced by slime molds are _________:



85. : Archegonia and Antheridia are born on ____________ in bryophytes:



86. : Aschelminthes is also called:



87. : Where does fertilization take place in bryophytes?



88. : Which is not included in Protostomes?



89. : Which is incorrect about alternation of generation in bryophytes?



90. : Which is not a coelomate?



91. : Antherozoids, the male gamete in bryophytes, are attracted to Archegonium (i.e., the female sex organ) by:



92. : The name animal is derived from the word __________:



93. : __________ bryophytes are the simplest ones:



94. : Which is not the characteristic of Kingdom Animalia?



95. : In liverworts, the zygote formed is:



96. : Which of the following is true about the class Psilopsida?



97. : The common name of the organism that produces a “black mold” in food is:



98. : The most primitive group of seed plants are:



99. : Xylem vessels are:



100. : Which group of plants shows the greatest variety of reproductive structures?



 

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