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TLS Online TPP Program

#Question id: 11204

Why do Na+ ions enter the cell when voltage-gated Na+ channels are opened in neurons?

#Unit 7. System Physiology – Animal

  1. because the Na+ concentration is much lower outside the cell than it is inside

  2. because the Na+ ions are actively transported by the sodium-potassium pump into the cell

  3. because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions are attracted to the negatively charged interior

  4. because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions are actively transported by the sodium-potassium pump into the cell

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TLS Online TPP Program

#Question id: 15281

#Unit 5. Developmental Biology

What is morphogen?
TLS Online TPP Program

#Question id: 15282

#Unit 5. Developmental Biology

what is the difference between morphogen and morphogenetic determinants?
TLS Online TPP Program

#Question id: 15283

#Unit 5. Developmental Biology

Following are certain statements regarding
morphogen gradients and cell specification.
A. Morphogens are always transcription factors
B. Morphogens can be paracrine factors that are produced in one group of cells and travel to another population of cells
C. When the concentration of a morphogen drops below a certain threshold, cells stop differentiating and never get determined to another fate
D. Morphogen gradients are involved in conditional specification
Which combination of the above statements is true?
TLS Online TPP Program

#Question id: 15284

#Unit 5. Developmental Biology

Morphogens can be:
1. Transcription factors
2. Paracrine factors
3. Cell adhesion factors
4. Non-diffusable molecules
TLS Online TPP Program

#Question id: 15285

#Unit 5. Developmental Biology

The range of a paracrine factor (and thus the shape of its morphogen gradient) not depends on:
TLS Online TPP Program

#Question id: 15286

#Unit 5. Developmental Biology

In the case of the French flag model. we assume a source of morphogen at one end and a sink at the other and that the concentrations of morphogen at both ends are kept constant but are different from each other. If the cells can respond to threshold concentrations of the morphogen, Thresholds can represent the