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Haryana Board Class 12 (HBSE) Biology — practice by topic

Browse 30 questions across 3 Biology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Biology topics

Biology (30)Biotechnology Principles and Processes (30)Class 12 Biology (30)

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Enzymes that cut DNA at specific sequences and are called molecular scissors are:Read the answer and worked solution →The enzyme that joins two DNA fragments end to end is DNA:Read the answer and worked solution →A small circular DNA that carries an alien gene into a host cell is called a:Read the answer and worked solution →DNA made by joining pieces from two different sources is called:Read the answer and worked solution →

Worked practice questions

Enzymes that cut DNA at specific sequences and are called molecular scissors are:

  1. Restriction enzymes
  2. Respiration enzymes
  3. Replication enzymes
  4. Regulation enzymes
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Correct answer: A. Restriction enzymes

1. Genetic engineering needs DNA cut at exact places. 2. One class of enzymes does this cutting. 3. They are the restriction enzymes. _Source: syllabus Biology Class XII, Chapter 11, Biotechnology Principles and Processes._

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The enzyme that joins two DNA fragments end to end is DNA:

  1. Laccase
  2. Ligase
  3. Lipase
  4. Lactase
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Correct answer: B. Ligase

1. After cutting, the pieces must be sealed together. 2. One enzyme forms that bond. 3. It is DNA ligase. _Source: syllabus Biology Class XII, Chapter 11, Biotechnology Principles and Processes._

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A small circular DNA that carries an alien gene into a host cell is called a:

  1. Vector
  2. Vesicle
  3. Vacuole
  4. Ventricle
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Correct answer: A. Vector

1. Plasmids carry foreign DNA the way a mosquito carries a parasite. 2. That carrier role has a name. 3. It is a vector. _Source: syllabus Biology Class XII, Chapter 11, Biotechnology Principles and Processes._

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