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MCQOPTIONS
This section includes 14620 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 13501. |
Which one of the following group of codons is called as degenerate codons? |
| A. | UAA, UAG and UGA |
| B. | GUA, GUG, GCA, GCG and GAA |
| C. | UUC, UUG, CCU, CAA and CUG |
| D. | UUA, UUG, CUU, CUC, CUA and CUG |
| Answer» B. GUA, GUG, GCA, GCG and GAA | |
| 13502. |
Identify the statements pertaining to the regulatory genes (R), associated with the lac operon that are incorrect. (i) mRNA is transcribed from the R gene whether lactose is present or not. (ii) mRNA is transcribed from the R gene only when the lactose is present. (iii) mRNA is transcribed from the R gene only when the lactose is not present. (iv) Lactose inhibits the translation or R gene mRNA. |
| A. | (i) and (ii) |
| B. | (ii) and (iii) |
| C. | (iii) and (iv) |
| D. | (ii), (iii) and (iv) |
| Answer» E. | |
| 13503. |
Which of the following statement forms the basis of DNA fingerprinting? |
| A. | The relative proportions of purines and pyrimidines in DNA. |
| B. | Satellite DNA occurring as highly repeated short DNA segments. |
| C. | The relative difference in the DNA occurrence in blood, skin and saliva. |
| D. | The relative amount of DNA in the ridges and grooves of the fingerprints. |
| Answer» C. The relative difference in the DNA occurrence in blood, skin and saliva. | |
| 13504. |
DNA packaging is the way DNA is folded into chromosomes that affects gene expression by: |
| A. | Controlling access to DNA. |
| B. | Positioning related genes near each other. |
| C. | Protecting DNA from mutations. |
| D. | Enhancing recombination of genes. |
| Answer» B. Positioning related genes near each other. | |
| 13505. |
Lac operon is: |
| A. | Arabinose operon |
| B. | Repressible operon |
| C. | Inducible operon |
| D. | Overlapping genes |
| Answer» D. Overlapping genes | |
| 13506. |
Thirty percent of the bases in a sample of DNA extracted from eukaryotic cells is adenine. What percentage of cytosine is present in this DNA? |
| A. | 0.1 |
| B. | 0.2 |
| C. | 0.3 |
| D. | 0.4 |
| Answer» C. 0.3 | |
| 13507. |
Which of the following is/are correct matching(s)? Codon Amino acid (i) \[^{5'}AU{{G}^{3'}}\] Serine (ii) \[^{5'}AU{{C}^{3'}}\] Tyrosine (iii) \[^{5'}AU{{G}^{3'}}\] Methionine (iv) \[^{5'}GU{{G}^{3'}}\] Valine |
| A. | (i) and (iii) |
| B. | All of these |
| C. | (ii), (iii) and (iv) |
| D. | (i),(ii) and (iii) |
| Answer» D. (i),(ii) and (iii) | |
| 13508. |
The key finding of the Hershey and Chase experiments on the mechanism of viral replication was that: |
| A. | Protein, not DNA, is the hereditary material. |
| B. | DNA, not protein, is the hereditary material. |
| C. | Protein and DNA play an equal role in determining inheritance. |
| D. | Neither protein nor DNA play a role in determining inheritance. |
| Answer» C. Protein and DNA play an equal role in determining inheritance. | |
| 13509. |
SNP which is pronounced as "snips" stands for: |
| A. | Small Nuclear Protein |
| B. | Single Nucleotide Particle |
| C. | Single Nucleotide Polymorphism |
| D. | Small Nicking Points |
| Answer» D. Small Nicking Points | |
| 13510. |
Who gave the 1st experimental proof of triplet code? |
| A. | George Gamow |
| B. | Nirenberg |
| C. | Kohenberg |
| D. | Khorana |
| Answer» C. Kohenberg | |
| 13511. |
Plasmid DNA contains genes that: |
| A. | Confer drug resistance to the host cell. |
| B. | Regulate conjugation. |
| C. | Can confer resistance to heavy metals. |
| D. | All of the above |
| Answer» E. | |
| 13512. |
Genetic code is: |
| A. | Triplet, universal, ambiguous and degenerate. |
| B. | Triplet, universal, non-ambiguous and non- degenerate. |
| C. | Triplet, universal, non-ambiguous and degenerate. |
| D. | Triplet, universal, ambiguous and non- degenerate. |
| Answer» D. Triplet, universal, ambiguous and non- degenerate. | |
| 13513. |
Plants that grow over the branches of trees without contact with soil are [Tamil Nadu 2001] |
| A. | Epiphytes |
| B. | Symbionts |
| C. | Saprophytes |
| D. | Parasites |
| Answer» B. Symbionts | |
| 13514. |
A rootless aquatic in which a portion of leaf is modified to form a bladder for catching small aquatic animals is [CPMT 1981, 84, 98] |
| A. | Dionaea |
| B. | Drosera |
| C. | Utricularia |
| D. | Nepenthes |
| Answer» D. Nepenthes | |
| 13515. |
Nepenthes is [MP PMT 1995] |
| A. | Both producer and primary carnivore |
| B. | Producer |
| C. | Consumer |
| D. | None of these |
| Answer» B. Producer | |
| 13516. |
Majority of the orchids are [JIPMER 1987] |
| A. | Epizoics |
| B. | Epiphytes |
| C. | Saprophytes |
| D. | Parasites |
| Answer» C. Saprophytes | |
| 13517. |
Which of the following statements are correct? (i) The deficiency of any element can cause multiple symptoms. (ii) Same symptoms may be caused by the deficiency of one or several different elements. (iii) The concentration of the essential element below which plant growth is retarded is termed as critical concentration. (iv) Chlorosis is the loss of chlorophyll due to deficiency of N, K, Mg, Fe, S, Mn, Zn Mo. (v) Different plants respond differently to the deficiency of the same element. |
| A. | (iii) and (iv) |
| B. | (i) and (iv) |
| C. | (i) and (iii) |
| D. | All of the above |
| Answer» E. | |
| 13518. |
The ability of the Venus Fly trap to capture insects is due to: |
| A. | Chemical stimulation by the prey. |
| B. | A passive process requiring no special ability on the part of the plant. |
| C. | Specialised "muscle-like" cells. |
| D. | Rapid turgor pressure changes. |
| Answer» E. | |
| 13519. |
Which of the following contains copper? |
| A. | Quinone |
| B. | Plastoquinone |
| C. | Plastocyanin |
| D. | None of these |
| Answer» D. None of these | |
| 13520. |
Which is the most abundant gas in our atmosphere that cannot be utilised by plants directly in its atmospheric form and is, therefore, captured by certain bacteria that live symbiotically in the nodules of roots? |
| A. | Oxygen |
| B. | Nitrogen |
| C. | Neon |
| D. | Hydrogen |
| Answer» C. Neon | |
| 13521. |
Choose a correct statement in accordance with essential mineral elements of plants. |
| A. | Minerals present in the soil cannot enter plants. |
| B. | Gold is the only element which cannot be accumulated by plants. |
| C. | Plants growing near nuclear test sites take up radioactive strontium. |
| D. | Minerals present in very low concentration cannot be detected and hence, they remain undiscovered. |
| Answer» D. Minerals present in very low concentration cannot be detected and hence, they remain undiscovered. | |
| 13522. |
Match the following and choose the correct combination from the options given. Column-I Column-II A. Photolysis of water I. Zinc B. Diazotrophy II. Copper C. Cytochrome ?c? oxidase III. Manganese D. Biosynthesis of IAA IV. Molybdenum E. V. Boron_ |
| A. | A-III, B-IV, C-II, D-I |
| B. | A-V, B-II, C-III, D-IV |
| C. | A-III, B-II, C-I, D-IV |
| D. | A-IV, B-I, C-III, D-II |
| Answer» B. A-V, B-II, C-III, D-IV | |
| 13523. |
Plants absorb mineral salts from the soil solution through: |
| A. | A semipermeable membrane into the cytoplasm. |
| B. | Perforations at the apex of root hair cells. |
| C. | The cell wall which is semipermeable. |
| D. | None of the above |
| Answer» B. Perforations at the apex of root hair cells. | |
| 13524. |
Generally, plants absorb \[{{N}_{2}}\] in the form of: |
| A. | \[N{{O}_{2}}^{-}\] |
| B. | \[N{{O}_{3}}^{-}\] |
| C. | \[N\equiv N\] |
| D. | \[HN{{O}_{3}}\] |
| Answer» C. \[N\equiv N\] | |
| 13525. |
The following reaction points out the process of \[\alpha \]-ketoglutaric acid \[+N{{H}_{4}}{{^{+}}_{{}}}NADPH\] \[\xrightarrow[dehydrogenase]{Glutamate}Glutamate+{{H}_{2}}O+NADP\] |
| A. | Nitrification |
| B. | Transamination |
| C. | Amination |
| D. | Reductive amination |
| Answer» E. | |
| 13526. |
The most abundant element present in the plants is: |
| A. | Iron |
| B. | Carbon |
| C. | Nitrogen |
| D. | Manganese |
| Answer» C. Nitrogen | |
| 13527. |
Which of the following is/are not an essential micronutrient? |
| A. | Boron |
| B. | Nickel and cadmium |
| C. | Molybdenum |
| D. | Zinc |
| Answer» C. Molybdenum | |
| 13528. |
Nitrogen is a component of |
| A. | Protein |
| B. | Chlorophyll |
| C. | Nucleic acid |
| D. | All the above |
| Answer» E. | |
| 13529. |
Symbiotic nitrogen fixation in non-leguminous plant is carried out by [Orissa JEE 2005] |
| A. | Azotobacter |
| B. | Brodyrhizobiun |
| C. | Clostridium |
| D. | Frankia |
| Answer» E. | |
| 13530. |
Which one of the following can fix atmospheric nitrogen directly |
| A. | Pea |
| B. | Brassica |
| C. | Castor |
| D. | Petunia |
| Answer» B. Brassica | |
| 13531. |
Which one of the following plant cannot fix atmospheric nitrogen directly |
| A. | Bean |
| B. | Castor |
| C. | Gram |
| D. | Pea |
| Answer» C. Gram | |
| 13532. |
Carrier proteins are involved in [MP PMT 1998; BVP 2003] |
| A. | Active transport of ions |
| B. | Passive transport of ions |
| C. | Water transport |
| D. | Water evaporation |
| Answer» B. Passive transport of ions | |
| 13533. |
The process by which minerals are absorbed is |
| A. | Active absorption |
| B. | Passive absorption |
| C. | Both [a] and [b] |
| D. | None of the above |
| Answer» D. None of the above | |
| 13534. |
Solutes are absorbed by a plant cell through [RPMT 1987, 88] |
| A. | Osmosis |
| B. | Diffusion |
| C. | Active absorption |
| D. | Passive absorption |
| Answer» D. Passive absorption | |
| 13535. |
Which of the following does not require carrier molecule during transport through cell membranes |
| A. | Diffusion |
| B. | \[N{{a}^{+}}\]and\[{{K}^{+}}\]transport |
| C. | Active transport of sugars and amino acids |
| D. | None of the above |
| Answer» B. \[N{{a}^{+}}\]and\[{{K}^{+}}\]transport | |
| 13536. |
Which of the following are trace elements |
| A. | Boron and manganese |
| B. | Copper and zinc |
| C. | Chlorine and molybdenum |
| D. | All the above |
| Answer» E. | |
| 13537. |
Cytochrome oxidase has [BHU 1984; AIIMS 1992] |
| A. | Mo |
| B. | Fe |
| C. | Zn |
| D. | B |
| Answer» C. Zn | |
| 13538. |
Fall of immature leaf is due to the deficiency of [AFMC 1997] |
| A. | Sulphur |
| B. | Phosphorus |
| C. | Sodium |
| D. | Zinc |
| Answer» E. | |
| 13539. |
Manganese\[\left( M{{n}^{++}} \right)\]ions are required in which part of the plant |
| A. | Leaves and fruits |
| B. | Leaves and seeds |
| C. | Fruits and seeds |
| D. | Fruit and stem |
| Answer» C. Fruits and seeds | |
| 13540. |
Micro-nutrients are [CPMT 1985, 87, 2002] |
| A. | Less important in nutrition than macro-nutrients |
| B. | As important in nutrition as macro-nutrients |
| C. | May be omitted from culture media without any detrimental effect on the plant |
| D. | Called micro because they play only minor role in nutrition |
| Answer» C. May be omitted from culture media without any detrimental effect on the plant | |
| 13541. |
Elements which maintains the solubility of calcium in the cells |
| A. | Manganese |
| B. | Copper |
| C. | Iron |
| D. | Boron |
| Answer» E. | |
| 13542. |
Which of the following shows that metabolic energy is required in the absorption of ions [MP PMT 1992] |
| A. | More ions absorption in presence of oxygen |
| B. | Less absorption of ions in presence of oxygen |
| C. | More ions absorption in presence of ATP |
| D. | More ions absorption in presence of NAD |
| Answer» D. More ions absorption in presence of NAD | |
| 13543. |
Penicillin inhibits bacterial multiplication because it: |
| A. | checks RNA synthesis. |
| B. | checks DNA synthesis. |
| C. | destroys chromatin formation. |
| D. | inhibits cell wall formation. |
| Answer» E. | |
| 13544. |
Which antibiotic inhibits peptide bond formation? |
| A. | Streptomycin |
| B. | Tetracyclin |
| C. | Chloramphenicol |
| D. | Neomycin |
| Answer» D. Neomycin | |
| 13545. |
Antibiotics are mostly got from: |
| A. | Fungi |
| B. | Virus |
| C. | Bacteria |
| D. | Cyanobacteria |
| Answer» D. Cyanobacteria | |
| 13546. |
Consider the following statements about organic farming. Which of the given statements are correct? (i) It utilises genetically modified crops like Bt cotton. (ii) It uses only naturally produced inputs like compost. (iii) It does not use pesticides and urea. (iv) It produces vegetables rich in vitamins and minerals. |
| A. | (ii), (iii) and (iv) |
| B. | (iii) and (iv) only |
| C. | (ii) and (iii) only |
| D. | (i) and (ii) only |
| Answer» D. (i) and (ii) only | |
| 13547. |
Cochineal insects have proved very useful for: |
| A. | Weeds control |
| B. | Parthenium control |
| C. | Cactus prevention |
| D. | Eichhornia prevention |
| Answer» D. Eichhornia prevention | |
| 13548. |
The bacterium that commonly lives in animal and human intestines is: |
| A. | Bacillus anthracis |
| B. | Vibrio cholera |
| C. | Escherichia coli |
| D. | Corynebacterium |
| Answer» D. Corynebacterium | |
| 13549. |
Which of the following plants are used as green manure in crop fields and in sandy soils? |
| A. | Dichanthlum annulatum and Azolla pinnata |
| B. | Crotalaria juncea and Alhagi maurorum |
| C. | Calotropis procera and Phyllanthus niruri |
| D. | Saccharum munja and Lantana camara |
| Answer» C. Calotropis procera and Phyllanthus niruri | |
| 13550. |
Which of the following is the pair ofbiofertilisers? |
| A. | Azolla and blue green algae |
| B. | Nostoc and legume |
| C. | Rhizobium and grasses |
| D. | Salmonella & E. coli |
| Answer» B. Nostoc and legume | |