MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following human cells contains 23 chromosomes? |
| A. | Zygote |
| B. | Normal liver cell |
| C. | Skin cell of female |
| D. | An ovum |
| Answer» E. | |
| 2. |
___________ are DNA threads which appear inside the nucleus at the time of cell division. |
| A. | Spindle fibers |
| B. | Centrioles |
| C. | Asters |
| D. | Chromosomes |
| Answer» E. | |
| 3. |
Walter Fleming, stained some cells with ______________, to see how chromosomes would look under the microscope. |
| A. | Perkin’s dye |
| B. | Iodine Dye |
| C. | Methyl blue Dye |
| D. | All A, B and C |
| Answer» B. Iodine Dye | |
| 4. |
The chromosomes are composed of? |
| A. | DNA |
| B. | Histone proteins |
| C. | RNA |
| D. | All A, B and C |
| Answer» E. | |
| 5. |
What is diploid number of chromosomes in Frog? |
| A. | 26 |
| B. | 28 |
| C. | 24 |
| D. | 20 |
| Answer» B. 28 | |
| 6. |
What is diploid number of chromosomes in Fern? |
| A. | 1000 |
| B. | 500 |
| C. | 400 |
| D. | 200 |
| Answer» B. 500 | |
| 7. |
Sister chromatids are attached at an area called the? |
| A. | Centrosome |
| B. | Centriole |
| C. | Centromere |
| D. | all of the above |
| Answer» D. all of the above | |
| 8. |
Nuclcotide arrangement in DNA can be seen by? |
| A. | X-ray crystallography |
| B. | Electron microscope |
| C. | Ultracentrifuge |
| D. | Light microscope |
| Answer» B. Electron microscope | |
| 9. |
An inborn error of metabolism which eventually affects mental development is? |
| A. | Albinism |
| B. | Phenylketonuria |
| C. | Anaemia |
| D. | Bleeder’s disease |
| Answer» C. Anaemia | |
| 10. |
Male is haploid in? |
| A. | Lizard |
| B. | Cockroach |
| C. | Honey bee |
| D. | Bats |
| Answer» D. Bats | |
| 11. |
Klinefelter’s syndrome has number of chromosomes? |
| A. | 47 |
| B. | 46 |
| C. | 45 |
| D. | 44 |
| Answer» B. 46 | |
| 12. |
Experimental material in the study of DNA replication has been? |
| A. | Escherichia coli |
| B. | Neurospora crassa |
| C. | Pneumococcus |
| D. | Drosophila melanogaster |
| Answer» B. Neurospora crassa | |
| 13. |
One gene one enzyme hypothesis was proposed by? |
| A. | Jacob and Monod |
| B. | Beadle and Tatum |
| C. | Watson and Crick |
| D. | Garrod and Jensen |
| Answer» C. Watson and Crick | |
| 14. |
DNA replication is? |
| A. | Conservative and discontinuous |
| B. | Semiconservative and semidiscontinuous |
| C. | Semiconservative and discontinuous |
| D. | Conservative |
| Answer» C. Semiconservative and discontinuous | |
| 15. |
Euploidy is... |
| A. | one chromosome more than haploid set |
| B. | one chromosome more than diploid set |
| C. | one chromosome less than haploid set |
| D. | Excat multiple of haploid set of chromosomes |
| Answer» E. | |
| 16. |
A DNA with unequal nitrogen bases would most probably be |
| A. | Single stranded |
| B. | Double stranded |
| C. | Triple stranded |
| D. | Four stranded |
| Answer» B. Double stranded | |
| 17. |
Exchange of one part of a chromosome with a part of the same or another chromosome is.. |
| A. | Translocation |
| B. | Inversion |
| C. | crossing over |
| D. | Nucleolus |
| Answer» B. Inversion | |
| 18. |
DNA tempalte sequence of CTGATAGC is transcribed over mRNA as |
| A. | GUCTUTCG |
| B. | GACUAUCG |
| C. | GAUTATUG |
| D. | UACTATCU |
| Answer» C. GAUTATUG | |
| 19. |
A colour blind daughter is born in case of |
| A. | colour blind mother, normal father |
| B. | carrier mother, colour blind father |
| C. | Normal mother, colour blind father |
| D. | carrier mother, normal father |
| Answer» C. Normal mother, colour blind father | |
| 20. |
Determination of percentage of crossing over between two linked genes is important in |
| A. | fixation of heterosis in organisms |
| B. | maintaining heterozygosity in population |
| C. | indicating relative position of genes in chromosomes |
| D. | explaining the phenomenon of coupling and repulsion |
| Answer» D. explaining the phenomenon of coupling and repulsion | |
| 21. |
Transcription involves synthesis of |
| A. | DNA |
| B. | tRNA |
| C. | mRNA |
| D. | rRNA |
| Answer» D. rRNA | |
| 22. |
Which one can induce polyploidy? |
| A. | Colchicine |
| B. | Acridines |
| C. | Ethylene |
| D. | Maleic hydrazide |
| Answer» B. Acridines | |
| 23. |
Recessive mutations are expressed in |
| A. | Heterozygous condition |
| B. | Homozygous condition |
| C. | Next generation |
| D. | Same generation |
| Answer» C. Next generation | |
| 24. |
In Drosophila, XXY is female. In humans it represents an abnormal male because |
| A. | Y-chromosome is essential for female sex in Drosophila |
| B. | Y-Chromosome induces male traits in humans |
| C. | Y-chromosome is not essential for male sex in humans |
| D. | None of these |
| Answer» C. Y-chromosome is not essential for male sex in humans | |
| 25. |
In humans, Philadelphia chromosome formed by reciprocal translocation between chromosomes |
| A. | 9 and 21 |
| B. | 9 and 20 |
| C. | 9 and 22 |
| D. | 20 and 10 |
| Answer» D. 20 and 10 | |
| 26. |
Genes exclusively present on Y-chromosome are called |
| A. | sex-linked |
| B. | Holandric |
| C. | Hologynic |
| D. | Histone |
| Answer» C. Hologynic | |
| 27. |
Number of barr bodies in XXXX female would be |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» C. 2 | |
| 28. |
A woman has a child with Klinefelter’s syndrome. Number of barr bodies present in the child is |
| A. | one |
| B. | two |
| C. | three |
| D. | none |
| Answer» B. two | |
| 29. |
According to genetic balance theory, X/A=1.5 will make the individual |
| A. | Metafemale |
| B. | Male |
| C. | Intersex |
| D. | None of these |
| Answer» B. Male | |
| 30. |
A normal green male Maize is crossed with albino female. The progeny is albino is albino because |
| A. | Trait for albinism is dominant |
| B. | The albinos have biochemical to destroy plastids derived from green male |
| C. | Plastids are inherited from female parent |
| D. | Green plastids of male must have mutated |
| Answer» D. Green plastids of male must have mutated | |
| 31. |
Smallest segment of genetic material affected by mutation is |
| A. | Muton |
| B. | Exon |
| C. | Cistron |
| D. | Recon |
| Answer» B. Exon | |
| 32. |
Which crop variety is not due to induced mutations? |
| A. | Reimei of rice |
| B. | Prabhat of Arhar |
| C. | Sharbati sonora of wheat |
| D. | Aruna of castor |
| Answer» E. | |
| 33. |
Harmful mutations do not get eliminated from gene pool because |
| A. | They have survival value |
| B. | Genetic drift |
| C. | They are formed repeatedly |
| D. | They are recessive and carried by heterozygous individuals |
| Answer» E. | |
| 34. |
Triticum aestivum (bread wheat) is |
| A. | Tetraploid |
| B. | Diploid |
| C. | Hexaploid |
| D. | Haploid |
| Answer» D. Haploid | |
| 35. |
Which one is de novo mutation? |
| A. | tt×tt→Tt |
| B. | TT×TT→TT |
| C. | Tt×tt→Tt |
| D. | Tt×Tt→TT,Tt,tt |
| Answer» B. TT×TT→TT | |
| 36. |
If haploid chromosome number is 10, the monosomic number shall be |
| A. | 19 |
| B. | 9 |
| C. | 10 |
| D. | 18 |
| Answer» B. 9 | |
| 37. |
Sex of a child is due to |
| A. | size of ovum |
| B. | Health of father |
| C. | Sex chromosome of father/sperm |
| D. | Sex chromosome of mother/ovum |
| Answer» D. Sex chromosome of mother/ovum | |
| 38. |
Diploid chromosome number in humans is |
| A. | 46 |
| B. | 44 |
| C. | 48 |
| D. | 42 |
| Answer» B. 44 | |
| 39. |
If BB represents barr body and Y0Y−body, XXY or Klinefelters syndrome has |
| A. | BB-1,Y0−0 |
| B. | BB-1,Y0-1 |
| C. | BB-0,Y0-1 |
| D. | BB-2,Y0-1 |
| Answer» C. BB-0,Y0-1 | |
| 40. |
In human beings 45 chromosomes/single X/XO abnormality causes |
| A. | Turner’s syndrome |
| B. | Edward’s syndrome |
| C. | Down’s syndrome |
| D. | Klinefelter’s syndrome |
| Answer» B. Edward’s syndrome | |
| 41. |
Turner’s syndrome is characterised by chromosomes |
| A. | 45 |
| B. | 46 |
| C. | 47 |
| D. | 48 |
| Answer» B. 46 | |
| 42. |
Nucleosome core is made of |
| A. | H1,H2A, H2B and H3 |
| B. | H2A, H2B, H3 and H4 |
| C. | H1,H2A, H2B, H3 and H4 |
| D. | H1, H2A, H2B, H4 |
| Answer» C. H1,H2A, H2B, H3 and H4 | |
| 43. |
Trisomy has chromosome complement of. |
| A. | 2n-1 |
| B. | 2n-1-1 |
| C. | 2n+1+1 |
| D. | 2n+1 |
| Answer» E. | |
| 44. |
Sex linked characters are generally.. |
| A. | Lethal |
| B. | recessive |
| C. | not inherited |
| D. | dominant |
| Answer» C. not inherited | |
| 45. |
In a dihybrid cross, two recessive genes showed 10% recombinants. The distance between two genes is. |
| A. | 10 map units |
| B. | 20 map units |
| C. | 30 map units |
| D. | 40 map units |
| Answer» B. 20 map units | |
| 46. |
A blue fowl obtained from mating between black and white fowls, is self-crossed. The F2 ratio is: |
| A. | 1 black:2 white: 1 blue |
| B. | 2 black: 1 white: 1 blue |
| C. | 1 black: 2 blue :1white |
| D. | None of these |
| Answer» D. None of these | |
| 47. |
Muller was awarded Nobel prize in 1946 for his work on: |
| A. | Protein synthesis |
| B. | chemistry of nucleic acids |
| C. | cancer |
| D. | X-ray induced mutations |
| Answer» E. | |
| 48. |
Mutations used in agriculture are commonly.. |
| A. | Induced |
| B. | spontaneous |
| C. | Lethal |
| D. | recessive and lethal |
| Answer» B. spontaneous | |
| 49. |
In Red-white flowered cross of Mirabilis jalapa, F2 generation has red, pink and white flowered plants in the ration of.. |
| A. | 1:2:1 |
| B. | 1:0:1 |
| C. | 2:1:1 |
| D. | 1:1:2 |
| Answer» B. 1:0:1 | |
| 50. |
Mendel found certain traits not ti assort independently. It is due to |
| A. | dominance |
| B. | linkage |
| C. | crossing over |
| D. | amitosis |
| Answer» C. crossing over | |