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CBSE Class 12 (Science) Biotechnology and its Applications — practice questions

Explore 66 free Biotechnology and its Applications questions in CBSE Class 12 (Science) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Biotechnology and its Applications questions and exercises with answers

Showing questions 1–30 of 66.

Bt toxin is produced by a bacterium of which genus?Read the answer and worked solution →Which of these is a Bt transgenic crop?Read the answer and worked solution →Inside the bacterium, the Bt toxin exists as an:Read the answer and worked solution →What converts the Bt protoxin into its active form?Read the answer and worked solution →Most Bt toxins are specific to a particular:Read the answer and worked solution →The Bt toxin is coded by a gene named:Read the answer and worked solution →Which genes control the cotton bollworms?Read the answer and worked solution →Which gene controls the corn borer?Read the answer and worked solution →Silencing a specific mRNA using double-stranded RNA is called:Read the answer and worked solution →Human insulin is made up of how many polypeptide chains?Read the answer and worked solution →The two insulin chains are linked together by:Read the answer and worked solution →In mammals, insulin is first synthesised as a:Read the answer and worked solution →Which extra stretch is removed as insulin matures?Read the answer and worked solution →Which company prepared the DNA sequences for human insulin?Read the answer and worked solution →In which year was that done?Read the answer and worked solution →The insulin chains were produced in plasmids of:Read the answer and worked solution →The first clinical gene therapy was given in the year:Read the answer and worked solution →The first gene therapy patient was a girl aged:Read the answer and worked solution →Adenosine deaminase is crucial for the functioning of the:Read the answer and worked solution →ELISA works on the principle of interaction between antigen and:Read the answer and worked solution →Order how the Bt toxin actsRead the answer and worked solution →Match each gene or termRead the answer and worked solution →Count the biotech numbersRead the answer and worked solution →True or false on biotechnologyRead the answer and worked solution →Which application is itRead the answer and worked solution →Fill the gaps on biotechnologyRead the answer and worked solution →Quick picks on biotechnologyRead the answer and worked solution →Spot the one that does not fitRead the answer and worked solution →What is the capacity of a single plant cell to regenerate a whole plant called?Read the answer and worked solution →Plants grown from one parent by micro-propagation are genetically identical and called what?Read the answer and worked solution →

Worked practice questions

Bt toxin is produced by a bacterium of which genus?

  1. Bacillus
  2. Bacteroid
  3. Bordetella
  4. Brucella
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Correct answer: A. Bacillus

1. The toxin gives its name to several transgenic crops. 2. Bt toxin is produced by a bacterium called Bacillus thuringiensis. 3. So the correct answer is Bacillus. _Source: syllabus Biology, Ch 12 'Biotechnology and its Applications'_

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Which of these is a Bt transgenic crop?

  1. Bt cotton
  2. Bt cactus
  3. Bt clover
  4. Bt coffee
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Correct answer: A. Bt cotton

1. The Bt toxin gene has been used to make crops resistant to insects. 2. Examples are Bt cotton, Bt corn, rice, tomato and potato. 3. So the correct answer is Bt cotton. _Source: syllabus Biology, Ch 12 'Biotechnology and its Applications'_

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Inside the bacterium, the Bt toxin exists as an:

  1. Inactive protamine
  2. Inactive protoxin
  3. Inactive protease
  4. Inactive proteins
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Correct answer: B. Inactive protoxin

1. This is why the toxin does not kill the Bacillus itself. 2. The Bt toxin protein exists as inactive protoxins. 3. It becomes active only inside the insect. _Source: syllabus Biology, Ch 12 'Biotechnology and its Applications'_

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