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: 11532

#Unit 6. System Physiology – Plant

Which of the following are the primary sites of IAA synthesis?

TLS Online TPP Program

#Question id: 11533

#Unit 6. System Physiology – Plant

 IAA biosynthesis is associated with__

TLS Online TPP Program

#Question id: 11534

#Unit 6. System Physiology – Plant

Which of the following is the precursor of auxin?

TLS Online TPP Program

#Question id: 11535

#Unit 6. System Physiology – Plant

During IPA pathway in the biosynthesis of auxin using  following enzymes except_____

TLS Online TPP Program

#Question id: 11536

#Unit 6. System Physiology – Plant

IAA has been found to be conjugated to both high- and low-molecular-weight compounds such as,

a) Low-molecular-weight conjugated auxins include esters of IAA with glucose or myo-inositol and amide conjugates such as IAA-N-aspartate

b) High-molecular-weight IAA conjugates include IAAglucan and IAA-glycoproteins found in cereal seeds

c) High-molecular-weight conjugated auxins include esters of IAA with glucose or myo-inositol and amide conjugates such as IAA-N-aspartate

d) Low-molecular-weight IAA conjugates include IAAglucan and IAA-glycoproteins found in cereal seeds

Which of the following is the correct prediction about low-and high-molecular weight ?

TLS Online TPP Program

#Question id: 11537

#Unit 7. System Physiology – Animal

Testosterone is an example of a chemical signal that affects the very cells that synthesize it, the neighboring cells in the testis, along with distant cells outside the gonads. Thus, testosterone is an example of ________.

 I) an autocrine signal

 II) a paracrine signal

 III) an endocrine signal