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TLS Online TPP Program

#Question id: 1511

Most tumors induce the formation of new blood vessels that invade the tumor and nourish it, a process called angiogenesis. Following statements are regarding to angiogenesis.

A. Angiogenesis allow the tumor to increase in size and thus increase the probability that additional harmful mutations will occur.

B. Angiogenesis also facilitates the process of metastasis.

C. The VEGF receptors, which are tyrosine kinases, regulate several aspects of angiogenesis such as endothelial cell survival and growth, endothelial cell migration, and vessel wall permeability.

D. VEGF expression can be induced by oncogenes and by hypoxia, defined as a partial pressure of oxygen of more than 7 mmHg.

E. A transcription factor VEGF is activated in low-oxygen conditions and which binds to and induces transcription of the HIF-1 gene which  affect the probability of tumor growth by angiogenesis.

Which of the following statements are incorrect?

#Unit 4. Cell Communication and Cell Signaling

  1. B and D

  2. A, C and E

  3. D only

  4. D and E

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TLS Online TPP Program

#Question id: 19223

#Unit 12. Applied Biology

Based on the DNA sequence of a commonly used binary vector some example are
1. pBIN19
2. pCB301
3. pBR322
Which of the following above statements are correct?
TLS Online TPP Program

#Question id: 11477

#Unit 7. System Physiology – Animal

How could you genetically modify an animal so that it would distinguish more shades of green?
TLS Online TPP Program

#Question id: 4984

#Unit 11. Evolution and Behavior

A hypothetical mutation in a squirrel population produces organisms with eight legs rather than four. Further, these mutant squirrels survive, successfully invade new habitats, and eventually give rise to a new species. The initial event, giving rise to extra legs, would be a good example of
TLS Online TPP Program

#Question id: 11079

#Unit 7. System Physiology – Animal

The diffusing capacity of a gas is the volume of gas that will diffuse through a membrane each minute for a pressure difference of 1 mm Hg. Which of the following gases is often used to estimate the oxygen diffusing capacity of the lungs?
TLS Online TPP Program

#Question id: 12375

#Unit 10. Ecological Principles

When lichens grow on bare rock, they may eventually accumulate enough organic material around them to supply the foothold for later rooted vegetation. These early pioneering lichens can be said to do what to the later arrivals?