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Biotechnology and its Applications · Question 52

AIPMT 2011 (Mains)MCQEasy📈 Topic in 75% papers+4−1
1

Silencing of mRNA has been used in producing transgenic plants resistant to:

  1. White rusts
  2. Nematodes
  3. Bacterial blights
  4. Bollworms

Answer

(2) Nematodes

Solution

As per NCERT, RNA interference (RNAi) involves silencing of a specific mRNA by a complementary dsRNA that binds to and prevents translation of the mRNA.

⇒ Using Agrobacterium vectors, nematode-specific genes were introduced into tobacco plants; the dsRNA formed silenced the mRNA of the nematode Meloidogyne incognita, so the parasite could not survive.

∴ mRNA silencing gave transgenic plants resistant to nematodes. (Bollworm resistance comes from Bt toxin genes.)

Answer: (2)

AIPMT 2011 (Mains)

Keep practising — Biotechnology and its Applications

2

Maximum number of existing transgenic animals is of :

  1. Mice
  2. Cow
  3. Pig
  4. Fish
AIPMT 2011 (Prelims)
3

The process of RNA interference has been used in the development of plants resistant to :

  1. Nematodes
  2. Fungi
  3. Viruses
  4. Insects
AIPMT 2011 (Prelims)
4

Which one of the following is now being commercially produced by biotechnological procedures?

  1. Insulin
  2. Morphine
  3. Nicotine
  4. Quinine
AIPMT 2010 (Mains)
5

DNA or RNA segment tagged with a radioactive molecule is called –

  1. Clone
  2. Probe
  3. Plasmid
  4. Vector
AIPMT 2010 (Prelims)
6

The genetically-modified (GM) brinjal in India has been developed for:

  1. Enhancing shelf life
  2. Insect-resistance
  3. Drought-resistance
  4. Enhancing mineral content
AIPMT 2010 (Prelims)
7

Genetic engineering has been successfully used for producing –

  1. transgenic models for studying new treatments for certain cardiac disease
  2. animals like bulls for farm work as they have super power
  3. transgenic mice for testing safety of polio vaccine before use in humans
  4. transgenic Cow-Rosie which produces high fat milk for making ghee
AIPMT 2010 (Prelims)
8

Some of the characteristics of Bt cotton are –

  1. High yield and production of toxic protein crystals which kill dipteran pests
  2. High yield and resistance to bollworms
  3. Long fibre and resistance to aphids
  4. Medium yield, long fibre and resistance to beetle pests
AIPMT 2010 (Prelims)
9

An improved variety of transgenic basmati rice

  1. gives high yield but has no characteristic aroma
  2. does not require chemical fertilizers and growth hormones
  3. is completely resistant to all insect pests and diseases of paddy
  4. gives high yield and is rich in vitamin A
AIPMT 2010 (Prelims)
10

The genetic defect – adenosine deaminase (ADA) deficiency may be cured permanently by

  1. Introducing bone marrow cells producing ADA into cells at early embryonic stages
  2. Periodic infusion of genetically engineered lymphocytes having functional ADA cDNA
  3. Administering adenosine deaminase activators
  4. Enzyme replacement therapy
AIPMT 2009
11

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
AIPMT 2009

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