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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Name an organism that produces cry proteins. - Biology

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प्रश्न

Name an organism that produces cry proteins.

अति संक्षिप्त उत्तर
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उत्तर

Cry protein is produced by Bacillus thuringiensis (Bt). The genes that control its production are called cry genes, such as CryIAb, CryIAc, and CryIIAb. This bacterium produces the protein in the form of endotoxin in the protoxin crystalline state.

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पाठ 14: Biotechnology and Its Applications - NCERT EXERCISES WITH ANSWERS [पृष्ठ ५५६]

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नूतन Biology [English] Class 12 ISC
पाठ 14 Biotechnology and Its Applications
NCERT EXERCISES WITH ANSWERS | Q 4. b. | पृष्ठ ५५६

संबंधित प्रश्‍न

Find out what the various components of the medium used for propagation of an explant in vitro are?


Explain the term biofortification.


Answer the following question:
Why do farmers find the production of hybrid seeds costly? 


A person deficient in the rhodopsin should be advised to take more of:


Bt Cotton is resistant to ______.


The trigger for activation of toxin of bacillus thuringlensis is ______.


Silencing of a gene could be achieved through the use of ______.


Bt cotton is resistant to pest, such as lepidopteron, dipterans and coleopterans. Is Bt cotton also resistant to other pests as well?


Insects in the Lepidopteran group lay eggs on maize crops. The larvae on hatching feed on maize leaf and tender cob. In order to arrest the spread of three such Lepidopteran pests, Bt maize crops were introduced in an experimental field.
A study was carried out to see which of the three species of lepidopteran pests was most susceptible to Bt genes and its product.
The lepidopteran pests were allowed to feed on the same Bt-maize crops grown on 5 fields (A-E).
The graph below shows the leaf area damaged by these three pests after feeding on maize leaves for five days.

Key for lepidopteran insect pest species

Species I
Species II
Species III

Insect gut pH was recorded as 10, 8 and 6 respectively for Species I, II and III respectively.

(a) Evaluate the efficacy of the Bt crop on the feeding habits of the three species of stem borer and suggest which species is least susceptible to Bt toxin.

(b) Which species is most susceptible to Bt-maize, and explain why?

(c) Using the given information, suggest why a similar effect was not seen in the three insect species.


RNA interference (RNAi) holds great potential as a therapeutic agent for the treatment of human diseases and as biocontrol agents in controlling pests in the field agriculture. An experiment was carried to study the use of 'RNAi' for the potential treatment of disorders of cholesterol metabolism. Some people possess genetic mutations with elevated levels of ApoB gene which predisposes them to coronary artery diseases.

Lowering the amount ApoB can reduce the number of lipoproteins and lower the blood cholesterol.

Tracy Zimmerman and her colleagues used RNAi in 2006 to reduce the level of ApoB in non human primates Cynomolgus monkeys.

One group of monkeys were given RNAi treatment (small interfering RNAs, SiRNAs) (doses 1 mg/kg, SiRNAs), second group of monkeys were given RNAi treatment (doses 2.5 mg/kg, SiRNAs) and third group of monkeys were injected with saline.

The results of the study are depicted in the graph below:

  1. How does the treatment with 2.5 mg/kg bring an effect on cholesterol metabolism when compared from 24 hours and 144 hours?
  2. Write any two natural sources from where dsRNA molecule could be obtained for silencing the specific mRNA.
  3. How is RNAi used in controlling the infection on the roots of tobacco plants by the nematode Meloidogyne incognitia?

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