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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: 962

#Unit 1. Molecules and their Interaction Relevant to Biology

The carbon in urea originates from ________.
TLS Online TPP Program

#Question id: 9256

#Unit 9. Diversity of Life Forms

Which of the following areas of study focuses on the exchange of energy, organisms, and materials between ecosystems?
TLS Online TPP Program

#Question id: 2412

#Unit 2. Cellular Organization

Actin-binding proteins that generate actin filament bundles:
TLS Online TPP Program

#Question id: 693

#Unit 1. Molecules and their Interaction Relevant to Biology

In an alpha helix, the R groups on the amino acid residues:
TLS Online TPP Program

#Question id: 21813

#Unit 12. Applied Biology

Which one of the following sensors measures acceleration and vibration?