DBT BET Previous Year Question Paper: 2012-2013 with Answer Key: Part 3 (Questions 51-100)

Biotechnology Eligibility Test Preparation

PLoSBiol3.5.Fig7ChromosomesAluFish
Alu sequence in Human Chromosomes (green fluorescence) Source Wikipedia

Biotechnology Eligibility Test (BET) for DBT JRF Award (2012-13)
Previous Year Question Papers with Answer Key, Explanations & References
Government of India, Ministry of Science & Technology
Department of Biotechnology, New Delhi

 PART: B Set 3 (Questions 51 – 100)


51. Suppressor tRNA mutations are those in which

a.       Transcription of tRNA genes is suppressed
b.      Translation form mRNA is suppressed due to absence of tRNA
c.       Amino acid is incorporated in place of a stop codon due to mutation in anticodon region of tRNA
d.      Charging of tRNA with cognate amino acids is suppressed due to mutation in amino acyl tRNA synthase enzyme

Ans. (c)

Suppressor tRNA: also called as nonsense suppressor, due to the suppressor tRNA mutations, an amino acid is incorporated into the stop codon due to mutation in the anticodons of tRNA so that the releasing factors of translation cannot binds to the complex and the translocation process continues.

52. Which of the following media is best suited for the selective growth of E. coli with genotype: Str+ His- leu- lys-?

a.       Minimal medium with thiamine, histidine, leucine and lysine
b.      Luria agar
c.       Minimal medium with thiamine and streptomycin
d.      Minimal medium with thiamine, histidine, leucine, lysine and streptomycin

Ans. (d)

Minimal medium: media that contains minimum nutrients possible for bacterial growth, usually without the presence of amino acids. They used by microbiologists and geneticists to grow “wild type” microorganisms and to select microbes against recombinants.

In the question, the given bacterium is mutated for Histidine, Leucine, and lysine and it has got an antibiotic resistant gene Str+.

53. Which of the following amino acid is coded by maximum number of codons?

a.       Leucine
b.      Tryptophan
c.       Valine
d.      Alanine

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HSST Botany Question Paper 2012 by Kerala PSC with Answer Key and Explanations Part 4

Botany lecture notes

Acanthaceae, Strobilanths
Strobilanths kunthiana (source wikipedia)

Kerala PSC HSST Botany 2012 Examination
Higher Secondary School Teacher: Junior & Senior
Question Paper Code 40/2012 (Cat. NO. 449/2010)

Original question paper of Kerala PSC HSST Botany Junior / Senior (Higher Secondary School Teacher Botany), Category No. 449/2010) examination conducted by Kerala PSC (Public Service Commission) on 13/04/2002 (Q. Code 40/2012) for the appointment of HSST Botany in Government Higher Secondary Schools of Kerala under the Directorate of Higher Secondary Education, Trivandrum, Govt. of Kerala. Questions are in MCQ (Multiple Choice Questions) format.

Part – 4 (Questions 76 – 100)

76.  Fossil fuels are:

a.       Renewable resources
b.      Non-renewable resource
c.       Inexhaustible resources
d.      Non-renewable and exhaustible resource

Ans. (d). Non-renewable and exhaustible resource

77.  Parthenocarpy is induced by the hormone:

a.      BAP
b.      GA
c.       IAA
d.      ABA

Question removed due to confusions in the options

Parthenocarpy: formation of fruit without fertilization. Parthenocarpic fruits are devoid of seeds, Eg. Banana

Gibberellin can induce the formation of seedless fruits but not through parthenocarpy but through stenospermocarpy

Stenospermocarpy: a biological phenomenon which induces seedless fruit formation in some fruits especially grapes. In stenospermocarpic fruits, normal pollination and fertilization is essential to ensure fruit formation. But during the course of fruit development spontaneous embryo abortion takes places and it leads to near seedless condition.  

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