MCQOPTIONS
Saved Bookmarks
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. |
The entry of a cell into M phase is initiated by _________________ |
| A. | interleukin factor |
| B. | maturation promoting factor |
| C. | transcription factor |
| D. | necrosis factor |
| Answer» C. transcription factor | |
| 2. |
Cyclin binding leads to a change in the _________________ of kinase. |
| A. | pH |
| B. | temperature |
| C. | concentration |
| D. | conformation |
| Answer» E. | |
| 3. |
Which term is used to refer to a period between the cell divisions? |
| A. | M phase |
| B. | G₀ phase |
| C. | Interphase |
| D. | Resting phase |
| Answer» D. Resting phase | |
| 4. |
Meiosis produces cells that have half the genetic content as their parent cells. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 5. |
There are ______ major phases in a cell cycle. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 6. |
DNA replication can be monitored by incorporation of ______________________ |
| A. | tyrosine |
| B. | thymidine |
| C. | cytosine |
| D. | nitite |
| Answer» C. cytosine | |
| 7. |
Asynchronous cultures are the ones whose cells are _______________________ |
| A. | of different origin |
| B. | randomly distributed through the cell cycle |
| C. | have different genomic content |
| D. | have different nutrient requirements |
| Answer» C. have different genomic content | |
| 8. |
Cytokinesis is the process of division of two daughter cells by the partitioning of _________________ |
| A. | DNA |
| B. | RNA |
| C. | Messenger RNA |
| D. | Cytoplasm |
| Answer» E. | |
| 9. |
Mitosis is the process of segregation of DNA molecules into 2 cells. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 10. |
How many phases of mitosis are there? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 11. |
During mitosis, the cell becomes less responsive to external stimuli. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 12. |
The term mitosis was coined in ____________ |
| A. | 1782 |
| B. | 1882 |
| C. | 1982 |
| D. | 1992 |
| Answer» C. 1982 | |
| 13. |
How many pathways of nucleotide excision repair exist? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 14. |
Which repair system operates to remove the altered bases generated by reactive chemicals present in the diet? |
| A. | Base excision repair |
| B. | Nucleotide excision repair |
| C. | Mismatch repair |
| D. | Double-stranded breakage repair |
| Answer» B. Nucleotide excision repair | |
| 15. |
Which of the following enzyme is responsible for initiating DNA replication? |
| A. | polymerase |
| B. | ligase |
| C. | primase |
| D. | gyrase |
| Answer» D. gyrase | |
| 16. |
Mutations in the DNA may be passed to the next generation. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 17. |
Which enzyme joins the Okazaki fragments into a continuous strand? |
| A. | gyrase |
| B. | topoisomerase |
| C. | ligase |
| D. | helicase |
| Answer» D. helicase | |
| 18. |
Who made the discovery that one DNA strand is synthesized discontinuously in fragments? |
| A. | Francis Crick |
| B. | Reiji Okazaki |
| C. | James Watson |
| D. | Louis Pasteur |
| Answer» C. James Watson | |
| 19. |
The lagging strand is synthesized discontinuously. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 20. |
Which enzyme removes the positive supercoils generated when the replication fork? |
| A. | helicase |
| B. | endonuclease |
| C. | exonuclease |
| D. | gyrase |
| Answer» E. | |
| 21. |
How many copies (approximately) of DNA polymerase III are present in a typical bacterial cell? |
| A. | 10 |
| B. | 50 |
| C. | 100 |
| D. | 200 |
| Answer» B. 50 | |
| 22. |
When was DNA polymerase III discovered as the major enzyme behind DNA replication in bacteria? |
| A. | 1949 |
| B. | 1959 |
| C. | 1969 |
| D. | 1989 |
| Answer» D. 1989 | |
| 23. |
Translesion synthesis polymerases lack processivity. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 24. |
Which if the following polymerases have an unusually spacious active site? |
| A. | DNA polymerases |
| B. | TLS polymerases |
| C. | RNA polymerases |
| D. | DNA helicases |
| Answer» C. RNA polymerases | |
| 25. |
Replicative polymerase Η belongs to a family of polymerases involved in ________________ |
| A. | translesion synthesis |
| B. | mRNA localization |
| C. | mRNA translation |
| D. | mRNA stability |
| Answer» B. mRNA localization | |
| 26. |
How many types of skin cancers can develop by overexposure to ultraviolet rays? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 27. |
Which form of Xeroderma pigmentosum is observed in patients who cannot synthesize functional polymerase Η? |
| A. | XP III |
| B. | XP IV |
| C. | XP V |
| D. | XP VI |
| Answer» D. XP VI | |
| 28. |
Xeroderma pigmentosum is caused by ______________________ |
| A. | UV radiations |
| B. | X-rays |
| C. | Gamma radiations |
| D. | Beta-rays |
| Answer» B. X-rays | |
| 29. |
Which repair system operates to repair DNA strands that are actively transcribed? |
| A. | Double-strand breakage repair |
| B. | Nucleotide excision repair |
| C. | RNA repair |
| D. | Messenger RNA repair |
| Answer» C. RNA repair | |
| 30. |
The NHEJ pathway is used to rectify __________________ in the DNA. |
| A. | nucleotide substitutions |
| B. | double-strand breaks |
| C. | single-strand breaks |
| D. | mismatched basepairs |
| Answer» C. single-strand breaks | |
| 31. |
A mismatched base pair can cause ________________ in the double helix. |
| A. | change in geometry |
| B. | change in location |
| C. | change in size |
| D. | change in alkalinity |
| Answer» B. change in location | |
| 32. |
Which of the following does not introduce double-strand breaks in the DNA? |
| A. | Gamma rays |
| B. | Cancer drugs |
| C. | Free radicals |
| D. | Inherited mutations |
| Answer» E. | |
| 33. |
Effective temperature considered in vernalisation is |
| A. | around 1°C |
| B. | around 4°C |
| C. | around 2°C |
| D. | around 10°C |
| Answer» C. around 2°C | |
| 34. |
Synchronization of reproductive behaviour of plants with their environment is done by |
| A. | photoperiodism and vernalisation |
| B. | respiration and vernalisation |
| C. | transpiration and photoperiodism |
| D. | respiration and transpiration |
| Answer» B. respiration and vernalisation | |
| 35. |
Plant which flower without being influenced by photoperiod is a |
| A. | long day plants |
| B. | short day plants |
| C. | day neutral plant |
| D. | noble plants |
| Answer» D. noble plants | |
| 36. |
P730 to p660 conversion occurs in/at |
| A. | dark |
| B. | night |
| C. | evening |
| D. | dawn |
| Answer» B. night | |
| 37. |
Parthenocarpy is sometime artificially induced for commercial purposes in |
| A. | potato |
| B. | cabbage |
| C. | tomato |
| D. | garlic |
| Answer» D. garlic | |
| 38. |
Nucleus of egg cell in cloning is destroyed by |
| A. | violet radiations |
| B. | heat |
| C. | cold |
| D. | water |
| Answer» B. heat | |
| 39. |
Fertilized ovum for further development is implanted in the |
| A. | cervix |
| B. | placenta |
| C. | uterus |
| D. | ureter |
| Answer» D. ureter | |
| 40. |
Gram positive bacteria neisseria gonorrhoeae causes |
| A. | gonorrhoa |
| B. | syphilis |
| C. | genital herpes |
| D. | acquired immune deficiency syndrome (AIDS) |
| Answer» B. syphilis | |
| 41. |
Effect of photoperiodism was first studied in 1920 by |
| A. | darwin |
| B. | garner and allard |
| C. | chargaff |
| D. | alois |
| Answer» C. chargaff | |
| 42. |
Vernalisation is induced by hormone |
| A. | veriline |
| B. | vermalin |
| C. | vernalin |
| D. | venralin |
| Answer» D. venralin | |
| 43. |
Cloning will be subjected to serious moral questions if applied to |
| A. | reptiles |
| B. | humans |
| C. | birds |
| D. | mammals |
| Answer» C. birds | |
| 44. |
During child birth, baby is delivered as a result of |
| A. | cervix dilation |
| B. | uterine contraction |
| C. | oxytocin release |
| D. | all of the above |
| Answer» E. | |
| 45. |
Sperm that queen bee recieves from male |
| A. | fertilizes the egg |
| B. | is kept stored in a pouch |
| C. | gets destroyed by the bacteria |
| D. | is not sterilized |
| Answer» C. gets destroyed by the bacteria | |
| 46. |
Stock refers to the |
| A. | plant with established root system |
| B. | portion of plant to be propagated |
| C. | form of corm |
| D. | onion bulb |
| Answer» B. portion of plant to be propagated | |
| 47. |
A reproductive cycle found in all female mammals except human is called |
| A. | oestrous cycle |
| B. | menstrual cycle |
| C. | menupause |
| D. | ovulatory cycle |
| Answer» B. menstrual cycle | |
| 48. |
Sperm fertilizes the |
| A. | primary oocyte |
| B. | oogonia |
| C. | secondary oocyte |
| D. | polar body |
| Answer» D. polar body | |
| 49. |
In plants, Radicle refers to the |
| A. | developing shoot |
| B. | developing root |
| C. | developing leaves |
| D. | developing cotyledon |
| Answer» C. developing leaves | |
| 50. |
Embryo at two celled stage has |
| A. | two blastomeres |
| B. | two gastromeres |
| C. | two centromere |
| D. | three blastomeres |
| Answer» B. two gastromeres | |