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TLS Online TPP Program

#Question id: 7124

Neural crest cells that follow a dorso-lateral route of migration under the skin will become melanocytes; how is their differentiation into melanocytes triggered during their migration?

#Unit 5. Developmental Biology
  1. The neural crest cells are already determined to become melanocytes before they leave the neural tube
  2. N-cadherin and E-cadherin are lost from the neural crest cells when they initiate their migration, and this signals the cells to become melanocytes.
  3. BMP and noggin control the fate of neural crest cells.
  4. The cells in the skin express a ligand (stem cell factor, SCF, also known as Steel) on their surface, which interacts with a receptor (Kit, also known as white spotting) on the surface of the neural crest derived cells; this interaction triggers their differentiation as melanocytes.
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TLS Online TPP Program

#Question id: 32146

#Unit 1. Molecules and their Interaction Relevant to Biology

Very broad but shallow minor groove found in
TLS Online TPP Program

#Question id: 2146

#Unit 2. Cellular Organization

In one catalytic cycle, the Na+/K+ ATPase transporter transports:
TLS Online TPP Program

#Question id: 11703

#Unit 7. System Physiology – Animal

A female athlete who took testosterone-like steroids for several months stopped having normal menstrual cycles. What is the best explanation for this observation?
TLS Online TPP Program

#Question id: 33464

#Unit 1. Molecules and their Interaction Relevant to Biology

A=T Minor groove in DNA molecule show chemical information as
TLS Online TPP Program

#Question id: 10547

#Unit 6. System Physiology – Plant

Which of the following responses are incorrect for closing of stomata?