Botany GATE Question Papers

1. Which of the following is a repressor of gibberellin signalling ?
(1) DELLA
(2) AUX
(3) HPT
(4) TTR1

2. Lampbrush chromosomes are seen in which stage of cell division ?
(1) Leptotene
(2) Diplotene
(3) Diakinesis
(4) Zygotene

3. Which of the following culture technique is most suitable for the production of secondary metabolite ?
(1) Protoplast culture
(2) Suspension culture
(3) Anther culture
(4) Embryo culture

4. DNA-dependent RNA polymerase catalyses transcription on one strand of the DNA, which is known as the
(1) Coding strand
(2) Prime strand
(3) Antistrand
(4) Template strand

5. Which one of the following is not a second messenger in signalling pathways ?
(1) cAMP
(2) Ca2+
(3) IP3
(4) B-galactosidase

6. Penicillin is toxic to many bacteria because
(1) It interferes with DNA replication.
(2) It inhibits transcription.
(3) It blocks protein synthesis.
(4) It inhibits cell wall formation.

7. Which one of the following is one of the steps of plant introduction which involves legal enforcement or restrictions on the movement of pest infected plant material or unwanted weeds from one country to another ?
(1) Acclimatization
(2) Distribution
(3) Quarantine
(4) Hybridization

8. Aquaporins are cell membrane protein channels controlling the selective movement of
(1) Oxygen
(2) Water
(3) ATP
(4) Sodium ions

9. Nod factors produced by nitrogen fixing bacteria are
(1) Calcium binding proteins
(2) Lipochitin oligosaccharides
(3) Glycosaminoglycans
(4) Zinc finger motif

10. Which of the following mRNAs has correct information for being translated completely ?
(1) 5’AUG UGA UUA AAG AAA 3′
(2) 5’AUG UAC UGA CCC CUG 3′
(3) 5’AGU UCC AGA ACG AAG 3’
(4) 5’AUG UAC AGU GGC UAG 3′

11. In recombinant DNA technology, after separation of radioactively labelled DNA they can be detected by placing the gel in contact with the sheet of X-ray film. This technique is called
(1) Microscopy
(2) Spectrophotometry
(3) Chromatography
(4) Autoradiography

12. Proteins which play important role in structural maintenance of chromosomes are
(1) Actin and elastin
(2) Fibronectin
(3) Cohesins and condensins
(4) Rho factors

13. What is the length of Okazaki fragments in Escherichia coli ?
(1) 1000 to 2000 nucleotides
(2) 500 to 1000 nucleotides
(3) 300 to 500 nucleotides
(4) 100 to 200 nucleotides

14. Regions of DNA with a palindrome sequence have a potential to form
(1) Hairpin structure
(2) Mirror repeat
(3) Hoogsteen pairing
(4) G-tetraplex

15. A plasmid can be distinguished from bacterial chromosomal DNA by which one of the following technique ?
(1) Electrophoresis
(2) Colony hybridization
(3) Somatic hybridization
(4) Splicing

16. The unusual property of Taq polymerase that is crucial for a polymerase chain reaction is its
(1) ability to use dNTP’s as substrate
(2) ability to use ddNTP’s as substrate
(3) ability to use RNA as template
(4) it’s thermostability

17. The ribosomal peptidyl transferase center resides in
(1) Large ribosomal subunit
(2) Small ribosomal subunit
(3) Acceptor arm of tRNA
(4) Anticodon loop of tRNA

18. Which one of the following enzyme “Splice” together two pieces of DNA that have been cut by the same restriction endonuclease ?
(1) Kinase
(2) Ligase
(3) Polymerase
(4) Lyases

19. Which of the following is the receptor of the two-component system in bacterial signalling ?
(1) Receptor His. Kinase
(2) β -andrenergic receptor
(3) β-globin
(4) Receptor Tyr. Kinase

20. If the DNA sequence in human is TTAGGG, that of Tetrahymena thermophila is TTGGGG and that of the plant Arabidopsis thaliana is TTTAGGG, then this sequence represent
(1) Transposable element
(2) Telomere
(3) Centromere
(4) Nucleosome

21. Which one of the following is not a photosynthetic pigment ?
(1) Chlorophyll
(2) Carotenoid
(3) Phycobilins
(4) Leghaemoglobin

22. Which statement about chloroplast is correct ?
(1) Chlorophast proteins are encoded only by chloroplastic DNA.
(2) Chloroplast genes exhibit Mendelian patterns of inheritance.
(3) Chloroplast reproduce by binary fission rather than by de novo synthesis.
(4) Chloroplast is an autonomous cell organelle.

23. Which one of the following techniques is used to determine the location of the binding site of a specific protein in a DNA sequence ?
(1) DNA finger printing
(2) DNase I foot printing
(3) Two hybrid Assay
(4) Polymerase chain reaction

24. When ultraviolet light passes through a solution of DNA, maximum absorption takes places at a wavelength of about
(1) 300 nm
(2) 280 nm
(3) 260 nm
(4) 400 nm

25. A shuttle vector is
(1) a plasmid capable of replicating in one organism.
(2) a plasmid capable’ of accepting large DNA inserts.
(3) a vector incapable of replicating in human cells.
(4) a vector capable of replicating in two different hosts.

26. Which one of the following is a mitochondrial marker enzyme ?
(1) Aldolase
(2) Acid phosphatase
(3) Succinate dehydrogenase
(4) Pyruvate dehydrogenase

27. Which one of the following phenomenon does not take place in plants during flooding and soil compactation ?
(1) Reduced respiration
(2) Fermentative metabolism
(3) ROS production
(4) Opening of stomata

28. Which one of the following method is made use of when probability of occurrence of rare events is very small ?
(1) Normal distribution
(2) Binomial distribution
(3) Poisson distribution
(4) Average distribution

29. Which one of the following enzyme is not a part of ROS scavenging process ?
(1) Superoxide dismutase
(2) Catalase
(3) Ascorbate peroxidase
(4) Helicase

30. Chloroplast transformation has become an important technique in plant biotechnology because
(1) expressed proteins are processed properly.
(2) very large transgene copy number may be obtained.
(3) transmission of plastids through pollen is high.
(4) integration of a transgene is unpredicted and random.

31. During day time, CAM (Crassulacean Acid Metabolizing) plants procure CO, for photosynthesis from
(1) Pyruvic acid
(2) Oxaloacetic acid
(3) Oxalic acid
(4) Malic acid

32. A mirror-imaged abnormal chromosome consisting of two copies of either a short arm or a Jong arm is characteristic feature of
(1) Isochromosome
(2) Sex chromosome
(3) Salivary gland chromosome
(4) Philadelphia chromosome

33. Genes that exhibit criss-cross inheritance are
(1) Dominant genes
(2) Codominant genes
(3) Sex-linked genes
(4) Sex-limited genes

34. Transgenic plants can act as living bioreactors for the production of useful chemicals and pharmaceuticals. This is known as
(1) Agriculture farming
(2) Molecular farming
(3) Organic farming
(4) Hydroponics

35. In aqueous solution, the acridine molecules bind to DNA inserting between adjacent base pairs. The process is called
(1) Depurination
(2) Substitution
(3) Transformation
(4) Intercalation

36. Which one of the following is not an example of episome ?
(1) Sex factor
(2) Prophage
(3) IS elements
(4) Sigma factor

37. Which one of the following banding pattern allows precise identification of different chromosome pairs and structural chromosome rearrangements ?
(1) C-banding
(2) G-banding
(3) Q-banding
(4) R-banding

38. The positively charged amino acids present in histones include
(1) Lysine and Arginine
(2) Alanine and Glycine
(3) Histidine and Serine
(4) Tyrosine and Cysteine

39. Which of the following growth hormone is related to insect and disease resistance in plants ?
(1) Auxins
(2) Cytokinins
(3) Gibberellins
(4) Jasmonates

40. Embryo rescue technique plays an important role in producing
(1) Seedless fruits
(2) Haploid plants
(3) Interspecific and intergeneric hybrids
(4) Transgenics

41. In which of the following DNA molecules are copied using the rolling circle replication process ?
(1) Plasmid
(2) B genome
(3) Yeast genome
(4) Drosophila genome

42. Chi sites are associated with
(1) Replication
(2) Homologous recombination
(3) RNA splicing
(4) DNA repair

43. In the primary cell wall of all dicot species and in many of the monocot species, the principal cross-linking glycans are
(1) Chitin
(2) Cellulose
(3) Xyloglycans
(4) Peptidoglycan

44. Which of the following central body is associated with collection, introduction, documentation, evaluation, maintenance, exchange and distribution of plant material of agri-horticultural crops in India ?
(1) Forest Research Institute, Dehradun
(2) National Bureau of Plant Genetic Resources, New Delhi
(3) Botanical Survey of India
(4) Central Rice Research Institute, Cuttack

45. Which one of the techniques is not employed for study of proteome ?
(1) Mass spectrometry
(2) MALDI-TOF
(3) 2-D gel electrophoresis
(4) Electrofusion

46. Radial movement of water in the root is through
(1) Apoplast
(2) Symplast
(3) Trans-membrane
(4) All of these

47. Which one of the following statements is not correct regarding vivipary ?
(1) Seed germinate within the fruit while it is still attached to the mother plant.
(2) It usually occurs in plants growing under shallow marine habitats.
(3) It occurs in the mangrove plants.
(4) It involves a dormancy period for the seed.

48. Circadian rhythm in plants was studied for the first time by
(1) Carolus Linnaeus, 1751
(2) M. De Mairan, 1729
(3) Borthwick and Hendricks, 1950
(4) Garner and Allard, 1920

49. The primary hormones regulating seed dormancy in plants are
(1) Abscisic acid and Gibberellins
(2) Gibberellins and Cytokinins
(3) Auxins and Ethylene
(4) Auxins and Cytokinins

50. Increased genetic diversity following extended time in plant tissue culture is called
(1) Gene knockout
(2) Gene inactivation
(3) Somaclonal variation
(4) Bioconversion