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TLS Online TPP Program

#Question id: 11145

Two fundamental concepts about the ion channels of a "resting" neuron are that the channels ________.

#Unit 7. System Physiology – Animal
  1. are always open, but the concentration gradients of ions frequently change
  2. are always closed, but ions move closer to the channels during excitation
  3. are open or closed depending on their type, and are specific as to which ion can traverse them
  4. open in response to stimuli, and then close simultaneously, in unison
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TLS Online TPP Program

#Question id: 14837

#Unit 5. Developmental Biology

Each of the three major strategies of cell specification summarized in TABLE  offers a different way of providing each embryonic cell with a set of determinants (often transcription factors) that will activate specific genes and cause the cell to differentiate into a particular cell type:

Choose right combinations;
TLS Online TPP Program

#Question id: 14838

#Unit 5. Developmental Biology

Sequence of amphibian lens induction postulated by experiments on embryos of the frog Xenopus laevis ; EXCEPT
TLS Online TPP Program

#Question id: 14839

#Unit 5. Developmental Biology

Given are certain facts which define ‘specification’ of a developing embryo.
 A. At the specification stage, commitment to cell identity is labile.
 B. At the specification stage, cell is capable of differentiating autonomously.
 C. The cell “knows” very early what it is to become without interacting with other cells.
 D. A phase where inductive signals trigger cell to determines their fate.
 Which of the above statements best define specification?
TLS Online TPP Program

#Question id: 14840

#Unit 5. Developmental Biology

If a cell or tissue type is able to differentiate according to its specified fate, it is assumed that commitment is:
TLS Online TPP Program

#Question id: 14841

#Unit 5. Developmental Biology

How cells became different from one another during embryonic development?
TLS Online TPP Program

#Question id: 14842

#Unit 5. Developmental Biology

If a specified cell is transplanted to a population of differently specified cells, the fate of the transplant will be:
A. Altered if the specification is reversible
B. Capable of differentiating by itself if the specification is reversible
C. Altered if the specification is irreversible
D. Capable of differentiating by itself if the specification is irreversible
Which of the following combination is correct?