Life Science Mock Test CSIR NET Exam - Part 12

This Quiz is posted with the sole aim of guiding the aspirants of UGC-NET / CSIR -NET Exam to the path of success. To sharpen the edges of your own intelligence and practice, in a structured and concrete manner to ensure you definite Success in your endeavor and will Pave your way for a successful career in Teaching (or) Research Profession . All the very best...... Knock the door of success......

1. 
    In a normal mammalian kidney, the hypertonicity of the urine is usually a function of____________.
   
   
   
   
   1.  Blood pressure
   
   
   2.  Loop of Henle
   
   
   3.  Blood glucose level
   
   
   4.  Glomerulus 
   
   
   
   
   
   
   
   
   


2. 
   Polyembryony is reported in the __________.
   
   
   
   
   1.  Wheat 
   
   
   2.  Ragi
   
   
   3.  Jowar
   
   
   4.  Mango
   
   
   
   
   
   
   
   
   


3. 
   In human pointed eyebrows are dominant to smooth eye brows and - widow's-peak (downward pointed frontal hairline) is dominant to continuous. hairline. What phenotypic ratio would you expect in the offspring from a cross between an individual heterozygous for both genes and an individual both genes and an individual _________.
   
   
   
   
   1.  1: 1: 1: 1
   
   
   2.  9: 3: 4
   
   
   3.  12: 3: 1 
   
   
   4.  1: 2: 1: 2: 1
   
   
   
   
   
   
   
   
   


4. 
   Which one of the following is used as a tracking dye for agarose gel electrophoresis of nucleic acids?
   
   
   
   
   1.  Comassie brilliant blue
   
   
   2.  Ethidium bromide
   
   
   3.  Amido black
   
   
   4.  Xylene-cynol
   
   
   
   
   
   
   
   
   


5. 
   You are carrying out sub-cellular fractionation by differential centrifugation. Which of the following cell component will pellet at the last?
   
   
   
   
   1.  Lysosomes  
   
   
   2.  Microsomes
   
   
   3.  Plasma membrane
   
   
   4.  Cytosol
   
   
   
   
   
   
   
   
   


6. 
   Satellite DNA are not typically found within which of the following parts of a chromosome?
   
   
   
   
   1. Telomeres
   
   
   2.  Euchromatin
   
   
   3.  Centromeres
   
   
   
   
   
   
   4.  Heterochromatin  
   
   
   
   
   
   
   
   
   


7. 
   Silent mutation __________.
   
   
   
   
   1.  changes only one DNA base in a codon without changing the amino acid sequence
   
   
   2.  creates a premature stop codon
   
   
   3.  substitutes one amino acid for a different amino acid with similar properties so it does not affect protein function
   
   
   4.  occurs outside protein coding region in the 5' and 3'untranslated region and thus does not affect protein function
   
   
   
   
   
   
   
   
   


8. 
   The "Serial Endosynibiosis" theory was proposed by __________.
   
   
   
   
   1.  Thomas Cavalier-Smith 
   
   
   2.  Robert Whittaker
   
   
   3.  Lynn Margulis 
   
   
   4.  Alfred Wegener
   
   
   
   
   
   
   
   
   


9. 
   The heteroduplex DNA means haploid DNA formed as a result of
   
   
   
   
   1.  transformation
   
   
   2.  deletion
   
   
   3.  recombination
   
   
   4.  transduction 
   
   
   
   
   
   
   
   
   


10. 
    Which molecular orbital has highest energy out of the following?
    
    
    
    
    1.  π* (2py)
    
    
    2.  σ (2px)
    
    
    3.  σ* (1s) 
    
    
    4.  σ (2s)
    
    
    
    
    
    
    
    
    

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