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‘Restriction’ in restriction enzyme refers to
Biology Exemplar
Biology Exemplar

Class 12

NCERT Exemplar

Publisher:
NCERT
Subject:
Biology
1

Chapter 1: Reproduction in Organisms

48 questions

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2

Chapter 2: Sexual Reproduction in Flowering Plants

52 questions

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3

Chapter 3: Human Reproduction

48 questions

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4

Chapter 4: Reproductive Health

37 questions

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5

Chapter 5: Principles of Inheritance and Variation

52 questions

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6

Chapter 6: Molecular Basis of Inheritance

71 questions

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7

Chapter 7: Evolution

52 questions

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8

Chapter 8: Human Health and Disease

70 questions

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9

Chapter 9: Strategies for Enhancement in Food Production

77 questions

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10

Chapter 10: Microbes in Human Welfare

59 questions

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11

Chapter 11: Biotechnology: Principles and Processes

48 questions

Q1
Which of the given statement is correct in the context of observing DNA separated by agarose gel electrophoresis?
Q2
‘Restriction’ in restriction enzyme refers to
Q3
Which of the following is not required in the preparation of a recombinant DNA molecule?
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12

Chapter 12: Biotechnology and its Applications

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13

Chapter 13: Organisms and Populations

70 questions

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14

Chapter 14: Ecosystem

68 questions

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15

Chapter 15: Biodiversity and Conservation

61 questions

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16

Chapter 16: Environmental Issues

52 questions

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Question
Easy
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Solving time: 2 mins

‘Restriction’ in restriction enzyme refers to

A
cleaving of phosphodiester bond in DNA by the enzyme

B
cutting of DNA at specific position only

C
prevention of the multiplication of bacteriophage in bacteria

D
All of the above

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Updated on: Feb 8, 2023

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(b) The restriction enzymes are called ‘molecular scissors’ and are responsible for cutting DNA. Restriction enzymes belong to a class of enzymes called nucleases.
They are of two types
(i) Exonucleases Cut DNA at the ends
(ii) Endonucleases Make cuts at specific positions within the DNA.
These enzymes are present in bacteria to provide a type of defense mechanism called the ‘restriction modification system’.
This system consist of two components, restriction enzyme and modification enzyme. The term ‘restriction’ refer to the function of these enzyme in restricting the propagation of foreign DNA of bacteriophage in host bacterium, i.e., cutting of DNA, at specific position only.
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Question Text
‘Restriction’ in restriction enzyme refers to
Updated OnFeb 8, 2023
TopicBiotechnology: Principles and Processes
SubjectBiology
ClassClass 12
Answer TypeText solution:1 Video solution: 10
Upvotes956
Avg. Video Duration4 min