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TLS Online TPP Program

#Question id: 20329

What are AHL molecules?

#Unit 4. Cell Communication and Cell Signaling
  1. consisting of a homocysteine lactone ring attached to an acyl chain of four to 18 carbon units.
  2. consisting of a homoserine lactone ring attached to an acyl chain of four to 18 carbon units.
  3. consisting of a homoserine lactone ring attached to an acyl chain of four to 16 carbon units.
  4. consisting of a homocysteine lactone ring attached to an acyl chain of four to 16 carbon units.
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TLS Online TPP Program

#Question id: 19214

#Unit 12. Applied Biology

Depending on the Ti plasmid, the length of the T-DNA region can vary from approximately 
TLS Online TPP Program

#Question id: 5761

#Unit 8. Inheritance Biology

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
TLS Online TPP Program

#Question id: 12804

#Unit 10. Ecological Principles

Trees are not usually found in the tundra biome because of
TLS Online TPP Program

#Question id: 3988

#Unit 3. Fundamental Processes

The tryptophan operon of E. coli is repressed by tryptophan added to the growth medium.  The tryptophan repressor probably:
TLS Online TPP Program

#Question id: 5529

#Unit 5. Developmental Biology

In humans, organogenesis in the embryo is basically accomplished by the end of which period of the pregnancy?