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Molecular Basis of Inheritance

Short Answer Type

61. How do mutations affect proteins structure and functions ?

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62. Explain non-sense mutation, mis-sense mutation and silent mutation.

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63.

In the medium where E. coli was growing, lactose was added, which induced the lac operon. Then, why does lac operon shut down some time after addition of lactose in the medium?

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One Word Answers

64.

What is the regulation of lac operon by repressor referred to?

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Short Answer Type

65. Give the chief characteristics of Eukaryotic operon.

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66. Differentiate between Introns and Exons.

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67. Differentiate induction and repression.

Differences between induction and repress

Induction

Repression

1. It is the switching on of an operon which normally remains turned off .

2. Regulator gene produces aporepressor that cannot block operator

1. It is turning off of an operon which normally remains switched on .

2. In this case, regulator gene produces a repressor that blocks the operator gene.

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68. Explain (in one or two lines) the function of following :
(a) Promoter
(b) tRNA
(c) Exons.

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69. Why is the Human Genome project called a mega project ?

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70. The biologists who study the developing embryos of multicellular organisms often refer to the development process as “selective gene action”. Why is this term appropriate name ?

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