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TLS Online TPP Program

#Question id: 5761

E. coli cells were spread on an agar plate, producing 1000 colonies.  The colonies are replica plated on two agar plates containing the antibiotic kanamycin and one agar plate without antibiotics.  All of the colonies are able to grow on the agar plate without antibiotic but only 4 colonies are able to grow on each of the agar plates containing kanamycin.  You notice that the four colonies that grew on each of the kanamycin containing plates are in the exact same position.  This demonstrates

#Unit 8. Inheritance Biology

  1. how to screen for environmental mutagens

  2. that mutations occur in prokaryotes as well as in eukaryotes

  3. that in some cases mutations are caused by the selective agent itself

  4. a direct correlation between the amount of the selective agent used and the number of resistant mutants (one-hit relationship)

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TLS Online TPP Program

#Question id: 5019

#Unit 11. Evolution and Behavior

A major evolutionary episode that corresponds in time most closely with the formation of Pangaea was the
TLS Online TPP Program

#Question id: 15479

#Unit 12. Applied Biology

Out of the following what usually supports the fastest growth rate and is therefore considered the preferred nitrogen source for E. coli
TLS Online TPP Program

#Question id: 23524

#General Aptitude

On the basis of the type of environment being polluted, we may recognize
TLS Online TPP Program

#Question id: 418

#Unit 1. Molecules and their Interaction Relevant to Biology

Biological oxidation-reduction reactions always involve:
TLS Online TPP Program

#Question id: 23521

#General Aptitude

Ozone layer depletion or hole in ozone layer is being chiefly found in