76. DNA molecule has small units called

1. 1. Purines

   
   
   

   2. Adenine and thymine

   
   
   

   3. Cistron, muton and recone

   
   
   

   4. Adenine

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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77. Which of the following professional are more likely to run the risk of a permanent change in their cell's DNA ?
    1. Rescarchers using carbon 14 isotope
    2. X - ray technicia
    3. Cola miner
    4. Dyer and painter
    Code

1. 1. 2 alone

   
   
   

   2. 1, 2 and 3

   
   
   

   3. 1, 2 and 4

   
   
   

   4. 1, 3 and 4

   
   
   

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   NA

   Correct Option: C

   NA

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78. Genetics deals with

1. 1. Mendel's laws

   
   
   

   2. Organic evolution

   
   
   

   3. DNA structure

   
   
   

   4. Heredity and variation

   
   
   

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   NA

   Correct Option: D

   NA

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79. Three law of heredity given by Mendal relate

1. 1. Gene linkage, Segregation and Independent assortments

   
   
   

   2. Gene linkage, Dominance and segregation

   
   
   

   3. Segregation, Independent assortments and dominance

   
   
   

   4. Segregation, Independent assortments and gene linkage

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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80. Which type of DNA is found in bacteria ?

1. 1. Straight DNA

   
   
   

   2. Helical DNA

   
   
   

   3. Circular DNA

   
   
   

   4. Membrane - bound DNA

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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