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Biotechnology and its Applications · Question 40

AIPMT 2015 (Cancelled)MCQEasy📈 Topic in 75% papers+4−1
1

In Bt cotton, the Bt toxin present in plant tissue as pro-toxin is converted into active toxin due to :

  1. action of gut micro-organisms
  2. presence of conversion factors in insect gut
  3. alkaline pH of the insect gut
  4. acidic pH of the insect gut

Answer

(3) alkaline pH of the insect gut

Solution

As per NCERT, Bacillus thuringiensis forms protein crystals containing a toxic insecticidal protein that exists as an inactive protoxin.

∵ Once an insect ingests the inactive toxin, it is converted into an active form due to the alkaline pH of the gut, which solubilises the crystals.

⇒ The activated toxin binds to the surface of midgut epithelial cells, creates pores, and causes swelling, lysis and death of the insect.

∴ Conversion is due to the alkaline pH of the insect gut.

Answer: (3)

AIPMT 2015 (Cancelled)

Keep practising — Biotechnology and its Applications

2

Which body of the Government of India regulates GM research and safety of introducing GM organisms for public services ?

  1. Research Committee on Genetic Manipulation
  2. Genetic Engineering Approval Committee
  3. Indian Council of Agricultural Research
  4. Bio-safety committee
AIPMT 2015 (Cancelled)
3

The crops engineered for glyphosate are resistant/tolerant to :

  1. Bacteria
  2. Herbicides
  3. Fungi
  4. Insects
AIPMT 2015 (Cancelled)
4

The first human hormone produced by recombinant DNA technology is :

  1. Estrogen
  2. Insulin
  3. Thyroxin
  4. Progesterone
AIPMT 2014
5

Which of the following Bt crops is being grown in India by the farmers ?

  1. Soybean
  2. Cotton
  3. Brinjal
  4. Maize
NEET 2013
6

RNA interference involves :-

  1. Interference of RNA in synthesis of DNA
  2. Synthesis of cDNA from RNA using reverse transcriptase
  3. Synthesis of mRNA from DNA
  4. Silencing of specific mRNA due to complementary RNA
NEET 2013 (Karnataka)
7

Which one of the following vectors is used to replace the defective gene in gene therapy ?

  1. Ti plasmid
  2. Cosmid
  3. Ri plasmid
  4. Adenovirus
NEET 2013 (Karnataka)
8

Tobacco plants resistant to a nematode have been developed by the introduction of DNA that produced (in the host cells) :

  1. An antifeedant
  2. A toxic protein
  3. Both sense and anti-sense RNA
  4. A particular hormone
AIPMT 2012 (Mains)
9

The first clinical gene therapy was given for treating

  1. Rheumatoid arthritis
  2. Adenosine deaminase deficiency
  3. Diabetes mellitus
  4. Chicken pox
AIPMT 2012 (Mains)
10

A single strand of nucleic acid tagged with a radioactive molecule is called

  1. Probe
  2. Selectable marker
  3. Vector
  4. Plasmid
AIPMT 2012 (Prelims)
11

Consumption of which one of the following foods can prevent the kind of blindness associated with vitamin 'A' deficiency?

  1. Flavr Savr tomato
  2. Canola
  3. Bt-brinjal
  4. Golden rice
AIPMT 2012 (Prelims)

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