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TLS Online TPP Program

#Question id: 16953

The ability of any stem cell to self-renew and differentiate depends on the structural organization and cellular function of specialized anatomic microenvironments known as stem cell niches. These sequestered regions are typically populated by a supportive network of stromal cells. Stem cell niche stromal cells express soluble and membrane-bound proteins that regulate cell survival, proliferation, differentiation, and trafficking. Which statements is true about HSCs?

#Unit 4. Cell Communication and Cell Signaling
  1. HSCs are not found in blood
  2. The organs that have microenvironments that support the differentiation of hematopoietic stem cells actually change over the course of embryonic development.
  3. Hematopoietic stem cells actually do not change over the course of embryonic development.
  4. HSCs do not take up residence in the bone marrow, which remains the primary site of hematopoiesis throughout adult life
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TLS Online TPP Program

#Question id: 32581

#Unit 2. Cellular Organization

Which of the following motor protein has a central motor domain and does not walk at all, but uses the energy of ATP hydrolysis to depolymerize microtubule ends? 
TLS Online TPP Program

#Question id: 28071

#Unit 6. System Physiology – Plant

During Water splitting/ oxygen evolution P680+ is directly reduced by
TLS Online TPP Program

#Question id: 11323

#Unit 10. Ecological Principles

Upwelling zones of high biological productivity are found along the western coasts of the major continents. What causes this upwelling?
TLS Online TPP Program

#Question id: 19800

#Unit 12. Applied Biology

What happens to cry protiens which is due to reduced binding of the toxin to midgut epithilium
TLS Online TPP Program

#Question id: 1836

#Unit 4. Cell Communication and Cell Signaling

What is the feature that best uniquely describes NK cell activity against a virus-infected cell?