Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 20039
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
More Questions
TLS Online TPP Program

#Question id: 21120

#Unit 12. Applied Biology

Which one of the following is a biomarker for hypertension?
TLS Online TPP Program

#Question id: 33480

#Unit 2. Cellular Organization

Finding: The overall degree of divergence between two homologous exons in related genes corresponds to the differences between the polypeptides.

Reason: Overall degree of divergence between two homologous exons is mostly a result of base substitutions.
TLS Online TPP Program

#Question id: 16146

#Unit 4. Cell Communication and Cell Signaling

If a given lymphocyte divides to form two daughter cells, both daughters bear antigen receptors with antigen specificities identical to each other and to the parental cell from which they arose, and so will any descendants they produce. The resulting population of lymphocytes, all arising from the same founding lymphocyte, is a clone. Which interleukin is responsible for clone production?
TLS Online TPP Program

#Question id: 6614

#General Aptitude

Find the missing sequence in the letter series, B, FH, LNP, 
TLS Online TPP Program

#Question id: 180

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statements about aromatic amino acids is correct?