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AP EAMCET Botany Unit 12: Biotechnology — practice questions — page 3

Explore 80 free Botany Unit 12: Biotechnology questions in AP EAMCET Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Botany Unit 12: Biotechnology questions and exercises with answers

Showing questions 61–80 of 80.

The Bt toxin is activated in the insect gut by what condition?Read the answer and worked solution →The activated Bt toxin kills the insect by doing what?Read the answer and worked solution →RNA interference protected tobacco from which pest?Read the answer and worked solution →RNAi silences a gene by doing what?Read the answer and worked solution →Human insulin was earlier extracted from the pancreas of which animals?Read the answer and worked solution →Mature insulin consists of two chains joined by what?Read the answer and worked solution →Which part of pro-insulin is removed during maturation?Read the answer and worked solution →Which company made human insulin chains in E. coli in 1983?Read the answer and worked solution →The first clinical gene therapy in 1990 treated which deficiency?Read the answer and worked solution →Which cells were engineered with ADA cDNA in the first gene therapy?Read the answer and worked solution →Which two techniques allow early diagnosis of infection by detecting nucleic acid or antigens?Read the answer and worked solution →ELISA is based on which principle?Read the answer and worked solution →PCR is routinely used to detect which virus in suspected patients?Read the answer and worked solution →Animals carrying an extra foreign gene are called what?Read the answer and worked solution →Over 95 percent of existing transgenic animals belong to which group?Read the answer and worked solution →The transgenic cow Rosie produced milk rich in which human protein?Read the answer and worked solution →Alpha-1-antitrypsin from transgenic animals is used to treat what?Read the answer and worked solution →Which body in India decides on the safety of GM organisms for public use?Read the answer and worked solution →Use of bio-resources without authorisation or compensation is termed what?Read the answer and worked solution →A 1997 US patent on which Indian crop caused public anger?Read the answer and worked solution →

Worked practice questions

The Bt toxin is activated in the insect gut by what condition?

  1. Acidic gut pH
  2. Alkaline gut pH
  3. Low oxygen level
  4. High temperature
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Correct answer: B. Alkaline gut pH

The inactive protoxin crystals are solubilised and activated by the alkaline pH of the insect gut.

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The activated Bt toxin kills the insect by doing what?

  1. Blocking photosynthesis
  2. Making pores in midgut cells
  3. Stopping egg laying
  4. Cutting the insect DNA
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Correct answer: B. Making pores in midgut cells

The toxin binds midgut epithelial cells and creates pores, causing swelling, lysis and death.

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RNA interference protected tobacco from which pest?

  1. Cotton bollworm
  2. Corn borer moth
  3. Meloidegyne nematode
  4. Aphid sap sucker
Show answer and solution

Correct answer: C. Meloidegyne nematode

Nematode-specific genes introduced with Agrobacterium produced dsRNA that silenced nematode mRNA.

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