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TLS Online TPP Program

#Question id: 9233

What is the biggest problem with selecting a site for a reserve?

#Unit 9. Diversity of Life Forms
  1. Making a proper selection is difficult because currently the environmental conditions of almost any site can change quickly.
  2. Keystone species are difficult to identify in potential reserve sites.
  3. Only lands that are not useful to human activities are available for reserves.
  4. Most of the best sites are inaccessible by land transportation, so making roads to them is often prohibitively expensive.
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TLS Online TPP Program

#Question id: 15739

#Unit 5. Developmental Biology

 In mammals, If no Y chromosome is present then transcription factors Wt1, Lhx9, GATA4, and Sf1 activate expression of:
TLS Online TPP Program

#Question id: 15738

#Unit 5. Developmental Biology

In humans and many other mammals, the sex chromosomes are called:
TLS Online TPP Program

#Question id: 15422

#Unit 5. Developmental Biology

During Vulval induction in C. elegans, the anchor cell secretes, a paracrine factor which receives by VPCs and become vulva. If the anchor cell is destroyed, the VPCs will not form a vulva. This is the example of:
TLS Online TPP Program

#Question id: 15420

#Unit 5. Developmental Biology

signal from the inducing cell is necessary for initiating new gene expression in the responding cell. Without the inducing cell, the responding cell is not capable of differentiating in that particular way, phenomena known as:
TLS Online TPP Program

#Question id: 15419

#Unit 5. Developmental Biology

Doris Taylor’s research group used detergents to remove all the cells from a cadaveric rat heart, which leaves behind the natural extracellular matrix. An extracellular matrix scaffold can promote the differentiation and rebuilding of a beating heart. The researchers then infused this ECM scaffold with cardiomyocytes. Now these cells differentiated and organized into a functionally contracting “recellularized” heart. Which of the following statement is correct?
TLS Online TPP Program

#Question id: 15418

#Unit 5. Developmental Biology

In which type of interaction, the responding tissue has already been specified and needs only an environment that allows the expression of particular traits?