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TLS Online TPP Program

#Question id: 10910

In early research on phloem translocation, both active and passive mechanisms were considered. All theories, both active and passive, assume an energy requirement in both sources and sinks. What will be the INCORRECT explanation of active and passive mechanism?

#Unit 6. System Physiology – Plant
  1. The passive mechanisms of phloem transport further assume that energy is required in the sieve elements of the path between sources and sinks

  2. In active mechanism required energy is simply to maintain structures such as the cell plasma membrane and to recover sugars lost from the phloem by leakage

  3. The active theories, postulate an additional expenditure of energy by path sieve elements in order to drive translocation itself
  4. The pressure-flow model is an example of a passive mechanism
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TLS Online TPP Program

#Question id: 28395

#Unit 5. Developmental Biology

One of the genes activated by VegT protein encodes the Sox17 transcription factor , these sox17 transcription factor is critical for which functions?
TLS Online TPP Program

#Question id: 28396

#Unit 5. Developmental Biology

VegT is critical in generating the germ cells, two genes activated by VegT protein that encodes the transcriptional factor as well as paracrine factors that instruct the cell layers to become their fate. which of the following statements is incorrect?
a) Sox17 paracrine factor that specify cells to be endoderm
b) Nodal transcription factors that instruct the cell layers above them to become mesoderm
c) Nodal paracrine factors that instruct the cell layers above them to become mesoderm
d) Sox17 transcription factor that specify cells to be endoderm
TLS Online TPP Program

#Question id: 28397

#Unit 5. Developmental Biology

During the specification of amphibian axes, in the absence of any induction cell leads to become which of the following fate?
TLS Online TPP Program

#Question id: 28398

#Unit 5. Developmental Biology

Spemann referred to the dorsal lip cells and their derivatives as the organizer, these derivatives cells are___
TLS Online TPP Program

#Question id: 28399

#Unit 5. Developmental Biology

Dorsal most vegetal cells of the blastula, which are capable of inducing the organizer is known as____
TLS Online TPP Program

#Question id: 28400

#Unit 5. Developmental Biology

Which of the following is the major candidate for the factor that forms the Nieuwkoop center ?