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TLS Online TPP Program

#Question id: 18732

Mechanism of ligation for both T4 DNA ligase and E. coli DNA ligase makes use of Adenosine Monophosphate (AMP). Which of the steps is involved in the ligation mechanism?

#Unit 13. Methods in Biology
  1. AMP is added to the 5’ phosphate of one of the DNA molecules
  2. It leads to the liberation of pyrophosphate from NAD and nicotinamide mononucleotide from ATP
  3. The AMP is further displaced by an electrophilic attack
  4. The AMP is further displaced by nucleophilic attack by 3’ hydroxyl of the same DNA molecule
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TLS Online TPP Program

#Question id: 1562

#Unit 4. Cell Communication and Cell Signaling

________ are cells of the mammalian innate immune response that help destroy tumors.
TLS Online TPP Program

#Question id: 28052

#Unit 1. Molecules and their Interaction Relevant to Biology

Attractive van der Waals forces occur 
TLS Online TPP Program

#Question id: 12103

#Unit 10. Ecological Principles

Which of the following is a good description of an ecological niche? 
TLS Online TPP Program

#Question id: 955

#Unit 1. Molecules and their Interaction Relevant to Biology

In amino acid catabolism the α-amino groups are initially released as ________.
TLS Online TPP Program

#Question id: 20325

#Unit 4. Cell Communication and Cell Signaling

In Gram-negative bacteria, autoinducers are often produced from