MCQOPTIONS
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MCQOPTIONS
This section includes 61 Mcqs, each offering curated multiple-choice questions to sharpen your 12th knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Where is the genetic information in body contained |
| A. | Structural proteins |
| B. | Enzymes |
| C. | DNA |
| D. | Enzymes and DNA |
| Answer» D. Enzymes and DNA | |
| 2. |
The terminal end of a chromosome is called |
| A. | Centromere |
| B. | Chromomere |
| C. | Telomere |
| D. | Metamere |
| Answer» D. Metamere | |
| 3. |
Each chromosome carries a distinct region which plays a fundamental role in chromosome movements during mitosis is |
| A. | Centromere or kinetochore |
| B. | Telomere |
| C. | Centriole |
| D. | Chromatid |
| Answer» B. Telomere | |
| 4. |
The smallest portion of gene which is responsible for mutation is called as: |
| A. | Operon |
| B. | Codon |
| C. | Recon |
| D. | Muton |
| Answer» E. | |
| 5. |
Relative morphologies of chromosome of an individual indicates his/her |
| A. | Genotype |
| B. | Phenotype |
| C. | Pedigree chart |
| D. | Karyotype |
| Answer» E. | |
| 6. |
Number of autosmes in human sperm is |
| A. | 11 |
| B. | 22 |
| C. | 44 |
| D. | 45 |
| Answer» C. 44 | |
| 7. |
The frequency of an allele in an isolated population may change due to |
| A. | gene flow |
| B. | mutation |
| C. | genetic drift |
| D. | natural selection |
| Answer» D. natural selection | |
| 8. |
Two allelic genes are located on |
| A. | The same chromosomes |
| B. | Two homologous chromosomes |
| C. | Two non-homologous chromosomes |
| D. | Any two chromosomes |
| Answer» C. Two non-homologous chromosomes | |
| 9. |
The gene which increases the frequency of mutation in other is referred to as |
| A. | Mutator gene |
| B. | Mutagene |
| C. | Hypostatic gene |
| D. | Complementary gene |
| Answer» B. Mutagene | |
| 10. |
The grouping of human chromosomes is based on |
| A. | Secondary constrictions alone |
| B. | Dot like satellites alone |
| C. | Banding pattern alone |
| D. | All the above |
| Answer» D. All the above | |
| 11. |
Telocentric chromosome differs from acrocentric chromosome in that |
| A. | The former has subterminal centromere whereas the later has a centrally located centrosome |
| B. | The centromere in the former is terminal and the later is subterminal |
| C. | The former has a terminal centromere and the later has a medially located centromere |
| D. | None of the above |
| Answer» C. The former has a terminal centromere and the later has a medially located centromere | |
| 12. |
Polytene or giant chromosomes are found in |
| A. | Salvary glands of man |
| B. | Salvary glands of woman |
| C. | Salvary glands of all animals |
| D. | Salvary glands of Drosophila |
| Answer» E. | |
| 13. |
Tjio and Levan's contribution is very significant because they |
| A. | gave the number of human chromosomes |
| B. | pointed out mutational changes |
| C. | identified barr bodies |
| D. | detected sex linkage |
| Answer» B. pointed out mutational changes | |
| 14. |
Traits controlled by genes located on autosomes are said to be |
| A. | sex affected |
| B. | sex influenced |
| C. | sex linked |
| D. | genetic traits |
| Answer» E. | |
| 15. |
Arrangement of chromosomes in the order of decreasing length is termed as |
| A. | Pedigree |
| B. | Eugenetics |
| C. | Idiogram |
| D. | Dysengenics |
| Answer» D. Dysengenics | |
| 16. |
Genetic information are carried in the form of long chain of molecules made-up-of |
| A. | Amino acids |
| B. | RNA |
| C. | Nucleotides |
| D. | Polypeptides |
| Answer» D. Polypeptides | |
| 17. |
A cistron is |
| A. | Structural of gene |
| B. | Functional unit of RNA |
| C. | Functional unit gene |
| D. | Replication unit of gene |
| Answer» D. Replication unit of gene | |
| 18. |
Balbiani discovered special type of chromosome from the salvary gand of chironomus larva which are recognized by the presence of |
| A. | Bands |
| B. | Loops |
| C. | Both bands and loops |
| D. | All of the above |
| Answer» D. All of the above | |
| 19. |
If the number of chromosomes in most body cells of a mammal is 40, the cells in the seminiferous tubule will have |
| A. | 40 chromosomes |
| B. | 20 chromosomes |
| C. | 10 chromosomes |
| D. | While some other will have 20 |
| Answer» E. | |
| 20. |
How many nucleosomes are found in helical coil of 30 nm chromatin fibre? |
| A. | 10 |
| B. | 12 |
| C. | 06 |
| D. | 09 |
| Answer» D. 09 | |
| 21. |
The frequency of a character is found to be increasing when |
| A. | The frequency of a character is found to be increasing when |
| B. | It is recessive |
| C. | It is adaptable |
| D. | It is inheritable |
| Answer» E. | |
| 22. |
The character which appears physically in an animal is |
| A. | Genotype |
| B. | Phenotype |
| C. | Heterotype |
| D. | Morphozygous |
| Answer» C. Heterotype | |
| 23. |
The haploid condition is found in |
| A. | Amoeba |
| B. | Bacteria |
| C. | Ovum |
| D. | Zygote |
| Answer» D. Zygote | |
| 24. |
A pair of contrasting character is termed as |
| A. | Allelomorphs |
| B. | Homozygous |
| C. | Heterozygous |
| D. | Polymorphs |
| Answer» B. Homozygous | |
| 25. |
When an allele fails to express itself in presence of the other allele, the former is said to |
| A. | Recessive |
| B. | Dominant |
| C. | Codominant |
| D. | Complementary |
| Answer» B. Dominant | |
| 26. |
If two opposite alleles come together, one finding morphological expression masking the other, the fact is described as law of |
| A. | Inheritance |
| B. | Dominance |
| C. | Limiting factor |
| D. | Segregation |
| Answer» C. Limiting factor | |
| 27. |
The sum of genes in a population is called |
| A. | Genotype |
| B. | Karyotype |
| C. | Gene pool |
| D. | Lethal gene |
| Answer» D. Lethal gene | |
| 28. |
Segregation of alleles takes place during |
| A. | Cleavage |
| B. | Melosis |
| C. | Fertilization |
| D. | Non-disjunction |
| Answer» C. Fertilization | |
| 29. |
Laws of segregation and dominance were given by |
| A. | Darwin |
| B. | Morgan |
| C. | Mendel |
| D. | De Vries |
| Answer» D. De Vries | |
| 30. |
A gene is said to be dominant, if |
| A. | It is never expressed in any condition |
| B. | It is expressed only in heterozygous |
| C. | It expresses its effect only in heterozygous state |
| D. | It is expressed both in heterozygous and heterozygous condition |
| Answer» E. | |
| 31. |
Chromatid is |
| A. | one half of chromosome |
| B. | haploid chromosome |
| C. | complete chromosome |
| D. | duplicate chromosome |
| Answer» B. haploid chromosome | |
| 32. |
A giant chromosome with a number of chromonemeta is |
| A. | Lampbrush chromosome |
| B. | Hetero chromosome |
| C. | Supernumerary chromosome |
| D. | Polytene chromosome |
| Answer» E. | |
| 33. |
Y-chromosome is |
| A. | Acrocentric |
| B. | Telocentric |
| C. | Submetacentric |
| D. | Acentric |
| Answer» B. Telocentric | |
| 34. |
X-chrosome is |
| A. | Telocentric |
| B. | Submetacentric |
| C. | Acrocentric |
| D. | D Acentric |
| Answer» C. Acrocentric | |
| 35. |
A chromosome with centromere near the middle is called |
| A. | metacentric |
| B. | submetacentric |
| C. | acrocentric |
| D. | telocentric |
| Answer» C. acrocentric | |
| 36. |
Homologous chrosomes which are present in male and female both are known as: |
| A. | Heterosomes |
| B. | Replosomes |
| C. | Androsomes |
| D. | Autosomes |
| Answer» E. | |
| 37. |
Number of autosome in a normal female is: |
| A. | 21 |
| B. | 22 |
| C. | 23 |
| D. | 44 |
| Answer» E. | |
| 38. |
Chromosome set in zygote is |
| A. | 2n |
| B. | 1n |
| C. | 3n |
| D. | D 4n |
| Answer» B. 1n | |
| 39. |
The chromosomes except those relating to sex are known as: |
| A. | Heterosomes |
| B. | Autosomes |
| C. | C Allosomes |
| D. | Cytosomes |
| Answer» C. C Allosomes | |
| 40. |
Nobel prize to Komberg and Ochoa was given for |
| A. | Artificial synthesis of genes |
| B. | Chemistry of DNA and RNA |
| C. | One gene one enzyme hypothesis |
| D. | Artificial sysnthesis of DNA |
| Answer» E. | |
| 41. |
The term 'gene' refers to: |
| A. | A portion of RNA |
| B. | A linkage group |
| C. | A portions of DNA |
| D. | A sequence of Amino |
| Answer» D. A sequence of Amino | |
| 42. |
In chrosomes, the material controlling heredity is |
| A. | DNA |
| B. | Histones |
| C. | Chromocentres |
| D. | RNA |
| Answer» B. Histones | |
| 43. |
The function of chrosomes of carrying genetic information from cell generation to another is performed by: |
| A. | RNA |
| B. | DNA |
| C. | Histones |
| D. | Calcium |
| Answer» C. Histones | |
| 44. |
Genes are made up of: |
| A. | Histones |
| B. | Lipoproteins |
| C. | Polynucleotides |
| D. | Hydrocarbons |
| Answer» D. Hydrocarbons | |
| 45. |
The chromosomes as thread like structures in nucleus was first described by: |
| A. | Mendel |
| B. | Strasburger |
| C. | Darwin |
| D. | Levitzky |
| Answer» C. Darwin | |
| 46. |
Lampbrush chromosomes are found inside |
| A. | Salvary glands of Drosophila |
| B. | Salvary gland of silk moth |
| C. | Oocytes of frog |
| D. | Nucleus of man |
| Answer» D. Nucleus of man | |
| 47. |
A normal metaphase chromosome with a midial centromere is: |
| A. | metacentric |
| B. | sub-metacentric |
| C. | acrocentric |
| D. | telocentric |
| Answer» B. sub-metacentric | |
| 48. |
The number of autosomes in man is |
| A. | 22 pairs |
| B. | 11 pairs |
| C. | 43 pairs |
| D. | 23 pairs |
| Answer» B. 11 pairs | |
| 49. |
Wilkins X-ray diffraction showed the diameter of the DNA helix as |
| A. | 10A |
| B. | 20A |
| C. | 30A |
| D. | 40A |
| Answer» C. 30A | |
| 50. |
The term 'gene' was first used by |
| A. | Johannsen |
| B. | Mendel |
| C. | Lemark |
| D. | Cuvier |
| Answer» B. Mendel | |