PYQSide ExamsMy practice

Biotechnology and its Applications · Question 62

AIPMT 2009MCQEasy📈 Topic in 75% papers+4−1
1

What is true about Bt toxin?

  1. The activated toxin enters the ovaries of the pest to sterilise it and thus prevent its multiplication.
  2. Bt protein exists as active toxin in the Bacillus
  3. The concerned Bacillus has antitoxins
  4. The inactive protoxin gets converted into active form in the insect gut

Answer

(4) The inactive protoxin gets converted into active form in the insect gut

Solution

As per NCERT, Bacillus thuringiensis forms protein crystals containing a toxic insecticidal protein.

The Bt toxin protein exists as an inactive protoxin in the bacterium, it does not kill the Bacillus itself.

Once an insect ingests it, the alkaline pH of the gut solubilises the crystals and the inactive protoxin is converted into the active toxin.

The active toxin binds to the surface of midgut epithelial cells and creates pores that cause swelling and lysis, and finally the death of the insect.

Answer: (4)

AIPMT 2009

Keep practising — Biotechnology and its Applications

2

Transgenic plants are the ones -

  1. Produced after protoplast fusion in artificial medium
  2. Produced by a somatic embryo in artificial medium
  3. Generated by introducing foreign DNA into a cell and regenerating a plant from that cell
  4. Grown in artificial medium after hybridization in the field
AIPMT 2009
3

What is antisense technology?

  1. RNA polymerase producing DNA
  2. Production of somaclonal variants in tissue cultures
  3. When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene
  4. A cell displaying a foreign antigen used for synthesis of antigens
AIPMT 2009
4

Cry I endotoxins obtained from Bacillus thuringiensis are effective against:

  1. Mosquitoes
  2. Flies
  3. Nematodes
  4. Boll worms
AIPMT 2008
5

Main objective of production/use of herbicide resistant GM crops is to:

  1. eliminate weeds from the field without the use of manual labour
  2. eliminate weeds from the field without the use of herbicides
  3. encourage eco-friendly herbicides
  4. reduce herbicide accumulation in food articles for health safety
AIPMT 2008
6

Human insulin is being commercially produced from a transgenic species of:

  1. Escherichia
  2. Mycobacterium
  3. Rhizobium
  4. Saccharomyces
AIPMT 2008
7

A transgenic food crop which may help in solving the problem of night blindness in developing countries is

  1. Flavr Savr tomatoes
  2. Bt soybean
  3. Starlink maize
  4. Golden rice
AIPMT 2008
8

Golden rice is a promising transgenic crop. When released for cultivation, it will help in

  1. Herbicide tolerance
  2. Alleviation of vitamin A deficiency
  3. Producing a petrol-like fuel from rice
  4. Pest resistance
AIPMT 2006
9

Bacillus thuringiensis (Bt) strains have been used for designing novel -

  1. Bio-metallurgical techniques
  2. Biofertilizers
  3. Bioinsecticidal plants
  4. Bio-mineralization processes
AIPMT 2005
10

Golden rice is a transgenic crop of the future with the following improved trait -

  1. High lysine (essential amino acid) content
  2. High protein content
  3. Insect resistance
  4. High vitamin A content
AIPMT 2005
11

ELISA is used to detect viruses, where the key reagent is :-

  1. Catalase
  2. RNase
  3. DNA probes
  4. Alkaline phosphatase
AIPMT 2004

All Biotechnology and its Applications PYQs →

PDFDownload Biotechnology and its Applications PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Zoology chapters
Class 11Animal KingdomStructural Organisation in AnimalsBiomolecules (Biology)Digestion and AbsorptionBreathing and Exchange of GasesBody Fluids and CirculationExcretory Products and their EliminationLocomotion and MovementNeural Control and CoordinationChemical Coordination and Integration
Class 12Human ReproductionReproductive HealthEvolutionHuman Health and DiseaseBiotechnology: Principles and ProcessesBiotechnology and its ApplicationsBiology Experimental Skills