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TLS Online TPP Program

#Question id: 2919

Topoisomerases play the essential role of unlinking the DNA molecules to allow them to separate into the two daughter cells for cell division. Which of the following statements regarding the mechanism of topoisomerases is INCORRECT?

#Unit 2. Cellular Organization

  1. Melting of the DNA strands is favored in highly negatively supercoiled DNA making this DNA an excellent substrate for relaxation.

  2. This product DNA is identical to the starting DNA molecule, except that the linking number has been increased by 1.

  3. Topoisomerase function requires that DNA cleavage, strand passage, and DNA rejoining all occur in a highly coordinated manner.

  4. The OH group from one broken DNA end attacks the phospho-tyrosine bond re-forming the DNA phosphodiester bond via ATP hydrolysis.

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TLS Online TPP Program

#Question id: 9617

#Unit 9. Diversity of Life Forms

The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed 3-chambered hearts (2 atria, 1 ventricle). Birds and mammals, however, are alike in having 4-chambered hearts (2 atria, 2 ventricles). The 4-chambered hearts of birds and mammals are best described as
TLS Online TPP Program

#Question id: 28373

#Unit 5. Developmental Biology

 A free Dorsal protein which are responsible for ventralization of the cell by moving into the nucleus, for these ventral cell fate running a cascade from Ventralizes vitelline membrane, in this cascade other such proteins are the part of ventral cell fate, except____
TLS Online TPP Program

#Question id: 12447

#Unit 10. Ecological Principles

During exponential growth,
TLS Online TPP Program

#Question id: 10782

#Unit 6. System Physiology – Plant

Which one of the following are not shown the characteristics of Saponins_____
TLS Online TPP Program

#Question id: 12787

#Unit 10. Ecological Principles

A cow's herbivorous diet indicates that it is a(n)