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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.
| 1901. |
The pacemaker of the human heart is: |
| A. | SA node |
| B. | Tricuspid valve |
| C. | AV node |
| D. | All of these |
| Answer» B. Tricuspid valve | |
| 1902. |
The purpose of the AV node is to __ and the purpose of the Purkinje fibres is to__. |
| A. | Create simultaneous atrial and ventricular depolarisation; speed up transmission of the cardiac impulse into the ventricle. |
| B. | Delay ventricular depolarisation relative to atrial depolarisation; insulate the cardiac impulse from the general ventricular fibres. |
| C. | Delay ventricular depolarisation relative to atrial depolarisation; transmit the cardiac impulse to very small localised groups of ventricular fibres. |
| D. | Delay atrial depolarisation relative to ventricular depolarisation; transmit the cardiac impulse to very small localized groups of ventricular fibres. |
| Answer» D. Delay atrial depolarisation relative to ventricular depolarisation; transmit the cardiac impulse to very small localized groups of ventricular fibres. | |
| 1903. |
Which of the following cations is require for the conversion of prothrombin into active thrombin by thromboplastin? |
| A. | \[C{{u}^{2+}}\] |
| B. | \[F{{e}^{3+}}\] |
| C. | \[F{{e}^{2+}}\] |
| D. | \[C{{a}^{2+}}\] |
| Answer» E. | |
| 1904. |
A vein possesses a large lumen because: |
| A. | Tunica media and tunica externa form single coat. |
| B. | Tunica media and tunica interna form single coat. |
| C. | Tunica interna, tunica media and tunica externa are thin. |
| D. | tunica media is a thin coat. |
| Answer» E. | |
| 1905. |
Haematocrit value is the expression of: |
| A. | Ratio of oxyhaemoglobin and reduced haemoglobin in blood. |
| B. | Ratio of normal and abnormal haemoglobin in blood. |
| C. | Ratio of red blood corpuscles to plasma in blood. |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 1906. |
In the ABO system of blood groups, if both antigens are present but no antibody, the blood group of the individual would be: |
| A. | B |
| B. | 0 |
| C. | AB |
| D. | A |
| Answer» D. A | |
| 1907. |
An open circulatory system occurs in: |
| A. | Reptiles |
| B. | Man |
| C. | Animals |
| D. | Insects |
| Answer» E. | |
| 1908. |
The blood protein involved in blood coagulation is: |
| A. | Heparin |
| B. | Prothrombin |
| C. | Thrombin |
| D. | All of these |
| Answer» C. Thrombin | |
| 1909. |
pH of blood in arteries and veins is: |
| A. | Same |
| B. | More in arteries and less in veins |
| C. | More in veins and less in arteries |
| D. | None of the above |
| Answer» C. More in veins and less in arteries | |
| 1910. |
Which of the following structures of the lymphatic system acts primarily as a filter for detecting and destroying microorganisms in lymph traveling through major lymph vessels? |
| A. | Lymph nodes |
| B. | Thymus |
| C. | Lymph capillaries |
| D. | Tonsil, but not the appendix |
| Answer» B. Thymus | |
| 1911. |
Which of the following accelerates extrinsic or tissue thromboplastin formation? |
| A. | Factor VII (proconvertin) |
| B. | Factor XI (plasma thromboplastin antecedent) |
| C. | Heparin |
| D. | Calcium |
| Answer» B. Factor XI (plasma thromboplastin antecedent) | |
| 1912. |
Which of the following is the largest lymphatic vessels of the human body? |
| A. | Lacteal duct |
| B. | Thoracic duct |
| C. | Cisterna chili |
| D. | Right lymphatic duct |
| Answer» C. Cisterna chili | |
| 1913. |
In genetic engineering, a chimera is: |
| A. | an enzyme that links DNA molecules. |
| B. | a pasmid that contains foreign DNA. |
| C. | a virus that infects bacteria. |
| D. | a fungi. |
| Answer» C. a virus that infects bacteria. | |
| 1914. |
DNA fragments with sticky ends are not allowed to undergo self ligation by: |
| A. | Unwindase |
| B. | Single strand binding proteins |
| C. | Gyrase |
| D. | Alkaline phosphatase |
| Answer» E. | |
| 1915. |
A nucleic acid probe might be used to: |
| A. | insert genes into a host cell. |
| B. | make DNA for gene cloning. |
| C. | splice pieces of DNA. |
| D. | identify complementary segments present in nucleic acid sequence. |
| Answer» E. | |
| 1916. |
Identify the correct statements. (i) The first recombinant DNA was constructed by using a piece of DNA from a plasmid carrying antibiotic resistance gene in the bacterium Salmonella typhimurium and linked it to the plasmid of E. coli. (ii) Cohen and Boyer are known as father of genetic engineering. (iii) When cut by the same restriction enzyme, the resultant DNA fragments have the same kind of sticky ends and these can be joined together using DNA ligases. (iv) Endonucleases remove nucleotides from the ends of the DNA whereas exonucleases make cuts at specific positions within the DNA. (v) Presence of more than one recognition sites within the vector will generate several fragments which will complicate the gene cloning. (vi) Humulin was the first recombinant DNA based product, produced and marketed in India. (vii) YAC vectors contain the telomeric sequence, the centromere and autonomously replicating sequence from yeast chromosomes. (viii)Alkaline phosphatase, is used to prevent unwanted self ligation of the vector DNA molecules in procedures of rDNA technology. (ix) pBR 322 vector was the first artificial ideal vector constructed by Boliver and Rodriguez. (x) Plasmid DNA is coated with histone proteins and can act as genetic factor. |
| A. | (ii), (iv), (vi) and (x) |
| B. | (ii), (iv), (v) and (x) |
| C. | (i), (iii), (v), (vii), (viii) and (ix) |
| D. | (i), (ii), (iv), (vi) and (x) |
| Answer» D. (i), (ii), (iv), (vi) and (x) | |
| 1917. |
Recombinant DNA can be transferred into host cell by: |
| A. | growing the host cell in growth medium containing ampicillin. |
| B. | coating the DNA with carbohydrates so that the cells will engulf the DNA. |
| C. | treating cells with calcium ions or electrical pulses to increase cell permeability. |
| D. | injecting proteins into host cells to make them more permeable. |
| Answer» D. injecting proteins into host cells to make them more permeable. | |
| 1918. |
A genetic marker is a: |
| A. | place where a restriction enzyme cuts DNA. |
| B. | chart that traces the family history of a genetic trait. |
| C. | nucleotide sequence near a particular gene. |
| D. | radioactive probe used to find a gene. |
| Answer» D. radioactive probe used to find a gene. | |
| 1919. |
Complementary base pairing is important for: |
| A. | ligation reactions with blunt-end DNA molecules. |
| B. | hybridization between DNA and transcription factors. |
| C. | restriction endonucleases to cut cell walls. |
| D. | synthesising cDNA molecules from mRNA templates. |
| Answer» E. | |
| 1920. |
DNA fragments are separated using gel electrophoresis: |
| A. | because DNA is pulled through the gel toward the negative end of the field. |
| B. | because larger DNA fragments move faster through the gel than smaller DNA fragments. |
| C. | to identify and isolate DNA fragments. |
| D. | to synthesise DNA for cloning. |
| Answer» D. to synthesise DNA for cloning. | |
| 1921. |
Due to chloramphenicol resistance gene, one is able to select a transformed cell in the presence of chloramphenicol. The chloramphenicol resistance gene in this case is called: |
| A. | Origin of replication |
| B. | Cloning sites |
| C. | Selectable marker |
| D. | None of the above |
| Answer» D. None of the above | |
| 1922. |
The introduction of TDA into plants involves: |
| A. | exposing the plants to cold for a brief period. |
| B. | allowing the plant roots to stand in water. |
| C. | infection of the plant by Agrobacterium tumefaciens. |
| D. | None of these |
| Answer» D. None of these | |
| 1923. |
Which of the following is not a genetic vector? |
| A. | Plasmid |
| B. | Phage |
| C. | Cosmid |
| D. | Virusoid |
| Answer» E. | |
| 1924. |
Problems in obtaining large amounts of proteins encoded by recombinant genes can often be overcome by using: |
| A. | BACs |
| B. | Expression vectors |
| C. | YACs |
| D. | All of these |
| Answer» E. | |
| 1925. |
Plasmids are suitable vectors for gene cloning because: |
| A. | these are small circular DNA molecule which can integrate with host chromosomal DNA. |
| B. | these are small circular DNA molecules with their own replication origin site. |
| C. | these can shuttle between prokaryotic and eukaryotic cells. |
| D. | these often carry antibiotic resistance genes. |
| Answer» C. these can shuttle between prokaryotic and eukaryotic cells. | |
| 1926. |
In microinjection method, the DNA is incorporated into host cell by using: |
| A. | Micro-pipettes |
| B. | Micro-needles |
| C. | High voltage electric impulse |
| D. | Both [a] and [b] |
| Answer» E. | |
| 1927. |
Most sensitive technique to detect malignant cell in non-Hodgkin's lymphoma is: |
| A. | Polymerase chain reaction |
| B. | Gene therapy |
| C. | Stem cell therapy |
| D. | None of the above |
| Answer» B. Gene therapy | |
| 1928. |
A \[{{T}_{4}}\] bacteriophage has a gene for the enzyme, lysozyme. The function of this enzyme is to digest: |
| A. | Cell wall |
| B. | Cell membrane |
| C. | Golgi |
| D. | Plasmid |
| Answer» B. Cell membrane | |
| 1929. |
Temperature required for various steps of polymerase chain reaction (i), (ii) and (iii) are: (i) Denaturation (ii) Annealing (iii) Extension |
| A. | (i) \[-94{}^\circ C\], (ii) \[-60{}^\circ C\], (iii) \[-72{}^\circ C\] |
| B. | (i)\[-40{}^\circ C\], (ii) \[-72{}^\circ C\], (iii) \[-94{}^\circ C\] |
| C. | (i) \[-72{}^\circ C\] (ii) - 94°C, (iii) \[-40{}^\circ C\] |
| D. | (i) \[-90{}^\circ C\], (ii) \[-72{}^\circ C\], (iii) \[-40{}^\circ C\] |
| Answer» B. (i)\[-40{}^\circ C\], (ii) \[-72{}^\circ C\], (iii) \[-94{}^\circ C\] | |
| 1930. |
Restriction enzymes are used in genetic engineering because: |
| A. | they can join different DNA fragments. |
| B. | they can cleave DNA at a specific target. |
| C. | they are nucleases that cut DNA at variable sites. |
| D. | they are proteolytic enzymes which can degrade harmful enzymes. |
| Answer» C. they are nucleases that cut DNA at variable sites. | |
| 1931. |
Restriction endonucleases: |
| A. | are enzymes that process pre-RNA. |
| B. | are enzymes that degrade DNA. |
| C. | protect bacterial cells from viral infection. |
| D. | None of the above. |
| Answer» C. protect bacterial cells from viral infection. | |
| 1932. |
The crops having cry genes need: |
| A. | no insecticide |
| B. | mild quantity of insecticide |
| C. | large amount of insecticide |
| D. | 5 kg insecticide / hectare |
| Answer» B. mild quantity of insecticide | |
| 1933. |
The pesticide most persistent in the soil is: |
| A. | DDT |
| B. | BHC |
| C. | Dieldrin |
| D. | Baygon |
| Answer» D. Baygon | |
| 1934. |
Consider the following statements. (i)In earlier days insulin extracted from pancreas of slaughtered cattle and pigs, was more efficient than genetically engineered insulin. (ii) PCR technique is being used for the detection of HIV and genetic mutations, in suspected cancer patients. (iii) Cystic fibrosis, heamophilia, cancer, Parkinson's etc., are treated by gene therapy. Which of the statements given above are correct? |
| A. | (i) and (ii) |
| B. | (i) and (iii) |
| C. | (ii) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» D. (i), (ii) and (iii) | |
| 1935. |
Given below are certain characteristics of thurioside protein. Which of the statement given are correct? (i) It is activated by alkaline pH of the gut of the insect pest ultimately killing it. (ii) It binds with the epithelial cells of the midgut of the insect pest ultimately killing it. (iii) It does not kill the carrier bacterium which is itself resistant to this toxin. |
| A. | (i) and (ii) |
| B. | (i) and (iii) |
| C. | (ii) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» B. (i) and (iii) | |
| 1936. |
Hirudin gene inserted in Brassica napus was: |
| A. | synthesised chemically. |
| B. | obtained from leech. |
| C. | obtained from Bacillus thuringiensis. |
| D. | Brassica campestris. |
| Answer» B. obtained from leech. | |
| 1937. |
Which is not a transgenic plant? |
| A. | Soyabean |
| B. | Maize |
| C. | Golden rice |
| D. | Cucumber |
| Answer» E. | |
| 1938. |
Recombinant DNA Technology prepared vaccine is called: |
| A. | First generation vaccine |
| B. | Second generation vaccine |
| C. | Third generation vaccine |
| D. | Synthesised vaccine |
| Answer» C. Third generation vaccine | |
| 1939. |
Match column-I with column-II and choose the correct option. Column-I Column-II A. Virus free plant I. Rhizobium B. Biofertiliser II. Cry gene C. Bt cotton III. Shoot apex D. Humulin IV. Diabetes |
| A. | A-II; B-I; C-IV; D-III |
| B. | A-III; B-I; C-II; D-IV |
| C. | A-II; B-III; C-I; D-IV |
| D. | A-IV; B-I; C-II; D-III |
| Answer» C. A-II; B-III; C-I; D-IV | |
| 1940. |
Following are the steps of southern blot procedure. (i) Autoradiography (ii) Hybridisation with radioactive nucleic acid (probe). (iii) Blotting (iv) DNA fragments are treated to make them single stranded. (v) Electrophoresis (vi) Clearing of DNA by restriction endonuclease. (vii) Isolation of DNA from sample The correct sequence is: |
| A. | (i), (ii), (iii), (iv), (v), (vi), (vii) |
| B. | (vii), (vi), (v), (iv), (iii), (ii), (i) |
| C. | (i), (ii), (vi), (vii), (iii), (iv), (v) |
| D. | (vii), (vi), (i), (ii), (v), (iii), (iv) |
| Answer» C. (i), (ii), (vi), (vii), (iii), (iv), (v) | |
| 1941. |
Strains of Bacillus thuringiensis are used in producing: |
| A. | Bioinsecticidal plants |
| B. | Biomineralisation |
| C. | Biometallurgical techniques |
| D. | Biofertilisers |
| Answer» B. Biomineralisation | |
| 1942. |
Which of the following GM crop is produced by antisense RNA technology where the expression of native gene is blocked? |
| A. | Bt cotton |
| B. | Golden rice |
| C. | Flavr Savr |
| D. | Golden Mustard |
| Answer» D. Golden Mustard | |
| 1943. |
Match column-I with column-II and choose the correct option. Column-I Column-II A. Bacillus Thuringiensis I. Production of chitinases B. Rhizobium meliloti II. Scavenging of Oil Spill C. Pseudomonas putida III. Incorporation of nif gene D. Trichoderma IV. Production of Bt toxin V. Production of human insulin |
| A. | A-II; B-IV; C-I; D-V; E-III |
| B. | A-II; B-IV; C-V; D-I; E-III |
| C. | A-IV; B-III; C-V; D-II; E-I |
| D. | A-V; B-IV; C-III; D-I; E-II |
| Answer» D. A-V; B-IV; C-III; D-I; E-II | |
| 1944. |
Match column-I with column-II and choose the correct option. Column-I Column-II A. Gene therapy I. Rhizobium B. Biofertiliser II. Cry gene C. Bt cotton III. SCID D. Humulin IV. Diabetes |
| A. | A-II; B-I; C-IV; D-III |
| B. | A-III; B-I; C-II; D-IV |
| C. | A-II; B-III; C-I; D-IV |
| D. | A-IV; B-I; C-II; D-III |
| Answer» C. A-II; B-III; C-I; D-IV | |
| 1945. |
Which of the following statements is incorrect? (i) Insulin was originally extracted from pancreas of slaughtered pigs and cattle. (ii) Animal insulin is difficult to obtain. (iii) Animal insulin is identical to human insulin. (iv) Non human insulin caused some patients to develop allergy. (v) Recombinant DNA allowed scientists to insert a human insulin gene into a bacterial expression vector. (vi) Recombinant insulin is actually obtained from E. coli bacterial cell. |
| A. | (i) and (ii) |
| B. | (iii) and (iv). |
| C. | Only (iii) |
| D. | Only (vi) |
| Answer» D. Only (vi) | |
| 1946. |
Protein engineering and drug designing requires CAMM (computer aided molecular modelling) because of: |
| A. | study of three dimensional structures of receptors and functional molecules. |
| B. | requirement of DNA recombinant technology. |
| C. | specificity of proteins. |
| D. | All of the above |
| Answer» B. requirement of DNA recombinant technology. | |
| 1947. |
Bioaugmentation is: |
| A. | the addition of commercially prepared catabolic activated bacterial strains to degrade wastes. |
| B. | the production of fertilisers by using bacteria and virus |
| C. | the metals are deposited as insoluble oxides and sulphides by activity of bacteria. |
| D. | the removal of pests. |
| Answer» B. the production of fertilisers by using bacteria and virus | |
| 1948. |
One of the following are transgenic organisms. |
| A. | Holly sheep and Tomato |
| B. | Dolly sheep and Subabul |
| C. | Molly sheep and Banana |
| D. | Bt Cotton and Tomato (Flavr Savr) |
| Answer» E. | |
| 1949. |
Select the correct set of the names for 1, 2, 3 and 4. |
| A. | 1234ProinsulinB-peptideA-peptideInsulin |
| B. | ProinsulinA-peptideB-peptideFree C-Pepitde |
| C. | ProinsulinA-peptideB-peptideInsulin |
| D. | ProinsulinB-peptideA-peptideFree C-peptide |
| Answer» C. ProinsulinA-peptideB-peptideInsulin | |
| 1950. |
In the treatment of SCID, cDNA is introduced into a patient's cells using.............as a vector. |
| A. | E coli |
| B. | Retrovirus |
| C. | Bacillus thuringiensis |
| D. | Agrobacterium |
| Answer» C. Bacillus thuringiensis | |