MCQOPTIONS
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MCQOPTIONS
This section includes 197 Mcqs, each offering curated multiple-choice questions to sharpen your NEET-UG knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
DNA fragments are |
| A. | Positively charged |
| B. | Negatively charged |
| C. | Neutral |
| D. | Either positively or negatively charged depending on their size |
| Answer» C. Neutral | |
| 52. |
The association of histone H1 with a nucleosome indicates: |
| A. | Transcription is occurring |
| B. | DNA replication is occurring |
| C. | The DNA is condensed into a Chromatin Fibre |
| D. | The DNA double helix is exposed |
| Answer» D. The DNA double helix is exposed | |
| 53. |
Which of the following facilitates opening of stomatal aperture? |
| A. | Contraction of outer wall of guard cells |
| B. | Decrease in turgidity of guard cells |
| C. | Radial orientation of cellulose microfibrils in the cell wall of guard cells |
| D. | Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells |
| Answer» D. Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells | |
| 54. |
Which one of the following is related to Ex-situ conservation of threatened animals and plants? |
| A. | Wildlife Safari parks |
| B. | Biodiversity hot spots |
| C. | Amazon rainforest |
| D. | Himalayan region |
| Answer» B. Biodiversity hot spots | |
| 55. |
Plants which produce characterstic pneumatophores and show vivipary belong to |
| A. | Mesophytes |
| B. | Halophytes |
| C. | Psammophytes |
| D. | Hydrophytes |
| Answer» C. Psammophytes | |
| 56. |
Coconut fruit is a |
| A. | Drupe |
| B. | Berry |
| C. | Nut |
| D. | Capsule |
| Answer» B. Berry | |
| 57. |
Root hairs develop from the region of |
| A. | Maturation |
| B. | Elongation |
| C. | Root cap |
| D. | Meristematic activity |
| Answer» B. Elongation | |
| 58. |
Viroids differ from viruses in having : |
| A. | DNA molecules with protein coat |
| B. | DNA molecules without protein coat |
| C. | RNA molecules with protein coat |
| D. | RNA molecules without protein coat |
| Answer» E. | |
| 59. |
Mycorrhizae are the example of |
| A. | Fungistasis |
| B. | Amensalism |
| C. | Antibiosis |
| D. | Mutualism |
| Answer» E. | |
| 60. |
The process of separation and purification of expressed protein before marketing is called |
| A. | Upstream processing |
| B. | Downstream processing |
| C. | Bioprocessing |
| D. | Postproduction processing |
| Answer» C. Bioprocessing | |
| 61. |
Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP? |
| A. | Lysosome |
| B. | Ribosome |
| C. | Chloroplast |
| D. | Mitochondrion |
| Answer» E. | |
| 62. |
Which of the following represents order of 'Horse'? |
| A. | Equidae |
| B. | Perissodactyla |
| C. | Caballus |
| D. | Ferus |
| Answer» C. Caballus | |
| 63. |
An example of colonial alga is |
| A. | Chlorella |
| B. | Volvox |
| C. | Ulothrix |
| D. | Spirogyra |
| Answer» C. Ulothrix | |
| 64. |
Spliceosomes are not found in cells of |
| A. | Plants |
| B. | Fungi |
| C. | Animals |
| D. | Bacteria |
| Answer» E. | |
| 65. |
Transplantation of tissues/organs fails often due to non-acceptance by the patient's body. Which type of immune-response is responsible for such rejections? |
| A. | Autoimmune response |
| B. | Cell-mediated immune response |
| C. | Hormonal immune response |
| D. | Physiological immune response |
| Answer» C. Hormonal immune response | |
| 66. |
A temporary endocrine gland in the human body is |
| A. | Pineal gland |
| B. | Corpus cardiacum |
| C. | Corpus luteum |
| D. | Corpus allatum |
| Answer» D. Corpus allatum | |
| 67. |
A dioecious flowering plant prevents both: |
| A. | Autogamy and xenogamy |
| B. | Autogamy and geitonogamy |
| C. | Geitonogamy and xenogamy |
| D. | Cleistogamy and xenogamy |
| Answer» C. Geitonogamy and xenogamy | |
| 68. |
The region of Biosphere Reserve which is legally protected and where no human activity is allowed is known as |
| A. | Core zone |
| B. | Buffer zone |
| C. | Transition zone |
| D. | Restoration zone |
| Answer» B. Buffer zone | |
| 69. |
Which of the following are not polymeric? |
| A. | Nucleic acids |
| B. | Proteins |
| C. | Polysaccharides |
| D. | Lipids |
| Answer» E. | |
| 70. |
During DNA replication, Okazaki fragments are used to elongate |
| A. | The leading strand towards replication fork |
| B. | The lagging strand towards replication fork |
| C. | The leading strand away from replication fork |
| D. | The lagging strand away from the replication fork |
| Answer» E. | |
| 71. |
Which one of the following statements is correct, with reference to enzymes? |
| A. | Apoenzyme = Holoenzyme + Coenzyme |
| B. | Holoenzyme = Apoenzyme + Coenzyme |
| C. | Coenzyme = Apoenzyme + Holoenzyme |
| D. | Holoenzyme = Coenzyme + Cofactor |
| Answer» C. Coenzyme = Apoenzyme + Holoenzyme | |
| 72. |
Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen? |
| A. | Bacillus |
| B. | Pseudomonas |
| C. | Mycoplasma |
| D. | Nostoc |
| Answer» D. Nostoc | |
| 73. |
The final proof for DNA as the genetic material came from the experiments of |
| A. | Griffith |
| B. | Hershey and Chase |
| C. | Avery, Mcleod and McCarty |
| D. | Hargobind Khorana |
| Answer» C. Avery, Mcleod and McCarty | |
| 74. |
The hepatic portal vein drains blood to liver from |
| A. | Heart |
| B. | Stomach |
| C. | Kidneys |
| D. | Intestine |
| Answer» E. | |
| 75. |
Which cells of 'Crypts of Lieberkuhn' secrete antibacterial lysozyme? |
| A. | Argentaffin cells |
| B. | Paneth cells |
| C. | Zymogen cells |
| D. | Kupffer cells |
| Answer» C. Zymogen cells | |
| 76. |
Which of the following is made up of dead cells? |
| A. | Xylem parenchyma |
| B. | Collenchyma |
| C. | Phellem |
| D. | Phloem |
| Answer» D. Phloem | |
| 77. |
Attractants and rewards are required for |
| A. | Anemophily |
| B. | Entomophily |
| C. | Hydrophily |
| D. | Cleistogamy |
| Answer» C. Hydrophily | |
| 78. |
What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis? |
| A. | The larger the fragment size, the farther it moves |
| B. | The smaller the fragment size, the farther it moves |
| C. | Positively charged fragments move to farther end |
| D. | Negatively charged fragments do not move |
| Answer» C. Positively charged fragments move to farther end | |
| 79. |
Which of the following are found in extreme saline conditions? |
| A. | Archaebacteria |
| B. | Eubacteria |
| C. | Cyanobacteria |
| D. | Mycobacteria |
| Answer» B. Eubacteria | |
| 80. |
Double fertilization is exhibited by |
| A. | Gymnosperms |
| B. | Algae |
| C. | Fungi |
| D. | Angiosperms |
| Answer» E. | |
| 81. |
Extraction of gold and silver involves leaching with CN– ion. Silver is later recovered by |
| A. | Liquation |
| B. | Distillation |
| C. | Zone refining |
| D. | Displacement with Zn |
| Answer» E. | |
| 82. |
Which of the following reactions is appropriate for converting acetamide to methanamine? |
| A. | Carbylamine reaction |
| B. | Hoffmann hypobromamide reaction |
| C. | Stephens reaction |
| D. | Gabriels phthalimide synthesis |
| Answer» C. Stephens reaction | |
| 83. |
Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field? |
| A. | Na |
| B. | K |
| C. | Rb |
| D. | Li |
| Answer» E. | |
| 84. |
The heating of phenyl-methyl ethers with HI produces. |
| A. | Ethyl chlorides |
| B. | Iodobenzene |
| C. | Phenol |
| D. | Benzene |
| Answer» D. Benzene | |
| 85. |
The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is |
| A. | Sublimation |
| B. | Chromatography |
| C. | Crystallisation |
| D. | Steam distillation |
| Answer» E. | |
| 86. |
Which of the following is dependent on temperature? |
| A. | Molality |
| B. | Molarity |
| C. | Mole fraction |
| D. | Weight percentage |
| Answer» C. Mole fraction | |
| 87. |
An example of a sigma bonded organometallic compound is : |
| A. | Ruthenocene |
| B. | Grignards reagent |
| C. | Ferrocene |
| D. | Cobaltocene |
| Answer» C. Ferrocene | |
| 88. |
Which of the following is a sink for CO? |
| A. | Haemoglobin |
| B. | Micro-organisms present in the soil |
| C. | Oceans |
| D. | Plants |
| Answer» C. Oceans | |
| 89. |
The correct statement regarding electrophile is |
| A. | Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile |
| B. | Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile |
| C. | Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile |
| D. | Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile |
| Answer» E. | |
| 90. |
The reason for greater range of oxidation states in actinoids is attributed to |
| A. | The radioactive nature of actinoids |
| B. | Actinoid contraction |
| C. | 5f, 6d and 7s levels having comparable energies |
| D. | 4f and 5d levels being close in energies |
| Answer» D. 4f and 5d levels being close in energies | |
| 91. |
A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy U of the gas in joules will be |
| A. | 1136.25 J |
| B. | –500 J |
| C. | –505 J |
| D. | +505 J |
| Answer» D. +505 J | |
| 92. |
Which one of the following statements is not correct? |
| A. | Catalyst does not initiate any reaction |
| B. | The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium |
| C. | Enzymes catalyse mainly bio-chemical reactions |
| D. | Coenzymes increase the catalytic activity of enzyme |
| Answer» C. Enzymes catalyse mainly bio-chemical reactions | |
| 93. |
Mixture of chloroxylenol and terpineol acts as |
| A. | Analgesic |
| B. | Antiseptic |
| C. | Antipyretic |
| D. | Antibiotic |
| Answer» C. Antipyretic | |
| 94. |
With respect to the conformers of ethane, which of the following statements is true? |
| A. | Bond angle remains same but bond length changes |
| B. | Bond angle changes but bond length remains same |
| C. | Both bond angle and bond length change |
| D. | Both bond angles and bond length remains same |
| Answer» E. | |
| 95. |
The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system? |
| A. | 10 Hz |
| B. | 20 Hz |
| C. | 30 Hz |
| D. | 40 Hz |
| Answer» C. 30 Hz | |
| 96. |
A thin prism having refracting angle 10° is made of glass of refractive index 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be |
| A. | 4° |
| B. | 6° |
| C. | 8° |
| D. | 10° |
| Answer» C. 8° | |
| 97. |
A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be |
| A. | 225 |
| B. | 450 |
| C. | 1000 |
| D. | 1800 |
| Answer» E. | |
| 98. |
Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will: |
| A. | Keep floating at the same distance between them |
| B. | Move towards each other |
| C. | Move away from each other |
| D. | Will become stationary |
| Answer» C. Move away from each other | |
| 99. |
Two cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m/s] |
| A. | 350 Hz |
| B. | 361 Hz |
| C. | 411 Hz |
| D. | 448 Hz |
| Answer» E. | |
| 100. |
A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system |
| A. | A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system |
| B. | Decreases by a factor of 2 |
| C. | Remains the same |
| D. | Increases by a factor of 2 |
| Answer» C. Remains the same | |