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BIOLOGY - GCET prep series 1 1. Hershey and Chase used _ __ __ Experimental material for proving that DNA controls heredity was a) Streptococcus pneumoniae b) Salmonella typhimurium c) T2 phage d) Saccharomyces cerevisiae 2. How can organisms sharing a common habitat avoid competition among species? I. unlimited resources II. behavioural changes III. resource partitioning a) Only I b) Only II & III c) Only I & II d) I, II & III 3. Two genetically variable individuals are needed to produce the progeny in only one of the following ? a) Cutting b) Layering c) Gootee d) Bud grafting 4. Which of the following is a true dihybrid condition is a) ttRr b) Ttrr c) ttrr d) TtRr 5. Name the Russian scientist who proposed the theory of origin of life: a) Oparin b) Haldane c) Miller d) Hooker 6. The Synthesis of a gene invitro & its transfer to a cell is called : a) Genetic engineering b) Cloning c) Mutation d) Hybridization 7. A disease caused due to molecular mutation is : a) Erythroblastosis foetalis b) Haemophilia Karuna Saraswat 9527915212 a) b) c) d) c) Anaemia d) Sickle cell anaemia 8. In angiosperms, the endosperm is formed after fertilization from : a) Synergids b) Secondary nucleus c) Antipodal cells d) Egg 9. Perianth is : a) Non – reproductive parts of flower b) Calyx c) corolla d) none of the above 10. The most primitive cell – like , self replicating chemical aggregates capable of growth were : a) Chemoautotrophs b) Eobionts c) Prokaryotes d) Coacervates 11. The hormone responsible for ovulation? a) FSH b) LH c) Testosterone d) Oestrogen 12. Testosterone is produced by : Sertoli cells Leydig’s cells Oxyntic cells Pituitary gland 13. Which of the following are the sex organelles provided in some bacteria. a) Circular DNA b) Gametes c) Sex pili d) Plasmid 14. T- Lymphocytes mature in which organ : a) Thymus b) Pancrease c) Liver d) Spleen 15. The Antiviral substances produced by many vertebrates in response to viral infection for resisting the multiplication of virus is called : Page 1 BIOLOGY - GCET prep series 1 a) viriod b) interferon c) antiviron d) antigen 16. “one gene – one enzyme hypothesis” states that a) one gene codes for one enzyme b) one gene codes for one polypeptide c) one gene codes for one amino acid d) one gene regulates all enzymes. 17. Golden rice is a transgenic crop with : a) insect resistance b) high yield c) high protein content d) high vitamin A content 18. Human placenta is derived from : a) ectoderm b) trophoblast c) endoderm d) mesoderm. 19. The theory of use and disuse of organs was proposed by: a) Charles Darwin b) Lamarck c) Hugo Devries d) Mendel 20. Plants always belong to the first trophic level in a food chain because : a) only they can synthesise food b) they absorb water and minerals c) they are present almost everywhere d) they have chloroplasts 21. Transcription involves a) protein synthesis over ribosomes b) lipids syntheoplasmic reticulum c) synthesis of RNA over DNA d) synthesis of DNA over RNA 22. In the process of making bread, the dough is fermented by : a) Thermus aquaticus b) Streptococcus pneumoniae c) Saccharomycetes cerevisiae d) Streptococcus faecalis 23. In a mutation when only one nucleotide is substituted for another, it is called : a) transduction b) point mutation c) inversion d) deletion 24. Hershey and Chase proved that a) DNA controls heredity. b) RNA controls heredity c) Proteins control heredity d) Lipids control heredity Karuna Saraswat 9527915212 25. A high fever is dangerous to the human body because it : a) Denatures enzymes b) Inactivates digestion c) Coagulates blood d) Boils fluids inside the body. 26. ELISA test is used to : a) Duplicate RNA b) Purify proteins c) Isolate DNA sequences d) Identify specific proteins 27. Chromosomes bearing satellites are called SAT – chromosomes. Prefix SAT stands for a) Sine acid Thymidine b) Sine Acid Thymine c) Sine Acid Tyrosine d) Satellite 28. Semiconservative DNA replication using 15 N was demonstrated by a) Griffith b) Avery, Mcleod, Mcarty c) Meselson & Stahl d) Hershey & Chase 29. Lung cancer may be caused by: a) Calcium phosphate b) Calcium fluoride c) Calcium chloride d) Calcium nitratre 30. Cri – du – chat syndrome occurs due to a) Deletion b) Duplication c) Inversion d) translocation 31. Evolution happens due to a) Mutations b) Acquired characters c) Natural selection d) Sexual reproduction 32. Characteristic flavour and large holes in Swiss cheese are formed due to the amount of CO2 , released by the bacterium a) Propionibacterium sharmanii b) Penicillium roquefortii c) Pediococcus acidilactici d) Saccharomyces cerevisiae 33. Which of the following provide non specific pathogen defence for the body a) T lymphocytes b) B lymphocytes c) Phagocytes d) NK cells 34. Code transfer for synthesis of polypeptide involves a) DNA, t RNA, rRNA & mRNA Page 2 BIOLOGY - GCET prep series 1 b) mRNA, tRNA, rRNA & DNA c) tRNA, DNA, mRNA & rRNA d) DNA, mRNA, tRNA & amino acids 35. Maximum formation of RNA occurs in a) Cytoplasm b) Nucleoplasm c) Nucleolus d) Ribosome 36. During the development of an embryo, which of the following occurs first a) Differentiation of organs b) Differentiation of tissues c) Differentiation of organ systems d) Differentiation of cells. 37. The maximum biomagnifications would take place in which of the following , in an aquatic ecosystem a) Zooplanktons b) Phytoplanktons c) Fishes d) Birds 38. Which one of the following theories was proposed by Weismann? a) Law of inheritance b) Theory of inheritance of acquired characters c) Theory of natural selection d) Theory of germ plasm 39. The process which destroys all living organisms is known as a) Pasteurization b) Sterilization c) Immunization d) fertilisation 40. The point where the sperm forms a) Axis of cleavage b) Grey crescent c) Dorsal lip of blasopore d) Centre of embryo rotation 41. Cells are bombarded with high velocity microparticles of gold coated with DNA in a method known as a) Biolistics b) Molecular gun c) Gene gun d) Both a & c 42. Lichens are an example of a) Parasitism b) Competition c) Commensalism d) Mutualism 43. The chromosome carrying centromeres at one end is a) Metacentric Karuna Saraswat 9527915212 b) Submetacentric c) Acrocentric d) telocentric 44. which of the following pyramid of biomass would be inverted a) fish & phytoplankton b) birds & insect c) cattle & grass d) humans & spinach 45. spermatogenesis starts at puberty due to increase in secretion of a) LH b) FSH c) GnRH d) Testosterone 46. Plant tissue culture allows growth of a whole plant from explants. This is possible due to a) MOET b) Metastasis c) Totipotency d) Biofortification. 47. The biotechnology method that protects plants against infection by pests is a) RNA interference b) RNA interpretation c) RNA ligation d) RNA transcription 48. What is the strategy used to prevent inbreeding depression a) Mating with unrelated superior animals of the same breed b) Conducting selfing c) Mating male and female animals of two different species d) Mating superior males of one breed with females of another breed 49. During transcription the template strand a) Has a polarity of 3’ ------- 5’ b) Does not have the promoter and terminator sequences c) Is required for synthesis of codons d) Has a methyl guanosine cap 50. In the Messelson and Stahl experiment , if E.coli was allowed to grow for 60 minutes the proportions of light and heavy DNA molecules would be a) 0 light, 2 hybrid , 6 heavy b) 6 light , 2 hybrid, 0 heavy c) 4 light, 4 hybrid, 0 heavy d) 8 light, 0 hybrid, 0 heavy 51. Choose the sexual stages of malarial parasites life cycle Page 3 BIOLOGY - GCET prep series 1 a) Blood stage b) Gametocyte c) Liver stage d) Sporozoite 52. For which of the following diseases a viral cause has been found a) Ascariasis b) Cancer c) Drug abuse d) Alcohol abuse 53. Rheumatoid arthritis is an example of a) Auto immune disease b) Allergies c) Humoral immune response d) Passive immunization 54. development of egg without fertilization is a) parthenocarpy b) polyembryony c) parthenogenesis d) adventive embryony 55. first vaccination was produced by a) Pasreur b) Jenner c) Leuwenhoek d) Paul Berg 56. A plant which is cultivated by tissue culture technique is a) Citrus b) Apple c) Pear d) Guava 57. Integrated pest management stands for a) Chemical control b) Biological control c) Host plant resistance d) Integration of the above 58. Ability of an organism to ward off infection is called a) Resistance b) Pathogenicity c) Infection d) Virulence 59. Fertility of soil is determined by its ability to a) Hold organic matter b) Retain water c) Retain nutrients d) Support life 60. Corpus luteum secretes a) LH b) Estrogen c) Progesterone d) FSH 61. Bacterial role of carbon cycle is Karuna Saraswat 9527915212 a) Chemosynthesis b) Photosynthesis c) Breakdown of organic matter d) Assimilation of nitrogenous compounds 62. DNA sequences are identified by a technique called a) Northern blotting b) Southern blotting c) ELISA d) RIA 63. Which of the following contains both DNA & RNA a) TMV & Poliomyelitis virus b) Bacteria & higher organism c) Bacteriophage & adenovirus d) HIV & Papiloma virus 64. If a colour blind man marries a normal visioned woman then a) Both sons & daughters will be colour blind b) All the daughters are colour blind c) All sons are normal d) All sons are colour blind 65. Farmers have reported over 50% higher yields of rice by using the biofertilizer a) Mycorrhiza b) Azolla pinnata c) Cyanobacteria d) Legume – Rhizobium symbiosis 66. Antrum is the cavity in the a) Testis b) Ovaries c) Primary follicle d) Graffian follicle 67. If the sequence of bases in DNA is ATTCGATG, then the sequence of bases in its transcript will be a) GUAGCUUA b) UAAGCUAC c) CAUCGAAU d) AUUCGAUG 68. First artificial gene was synthesized by a) Nirenberg b) Mendel c) Morgan d) Khorana 69. The stimulant present in tea is a) Tannin b) Cocaine c) Caffeine d) Nicotine 70. Lichens indicate pollution by a) Ozone b) SO3 Page 4 BIOLOGY - GCET prep series 1 c) NO3 d) CO 71. Non conventional sources of energy is a) Coal b) Wood c) Petroleum d) Biogas 72. In which of the following plants can self pollination never occur either naturally or artificially? a) Zea mays b) Gossypium hirsutum c) Carica papaya d) Saccharum officinarum c) Egg cell d) Synergids 74. Which one is primary sex organ? a) Scrotum b) Penis c) Testis d) Prostarate 75. Middle piece of a mammalian sperm contains a) Nucleus b) Centriole c) Mitochondria d) Vacuole ---------------------------------------------------------------------------------- 73. In Angiosperms , pollen tubes liberate their male gametes into the a) Central cell b) Antipodal cell Karuna Saraswat 9527915212 Page 5 BIOLOGY - GCET prep series 1 Karuna Saraswat 9527915212 Page 6