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TLS Online TPP Program

#Question id: 5128

During lens formation in the Xenopus, the following statements have been proposed. Which statement is incorrect?

#Unit 5. Developmental Biology

  1. Expression of Pax6 protein may constitute the competence of the surface ectoderm to respond to the optic vesicle during the late neurula stage.

  2. The optic vesicle secretes BMP and FGF family paracrine factors that induce the synthesis of the Sox transcription factors and initiate lens formation.

  3. If Pax6 is lost, whether it is in fruit flies, frogs, rats, or humans, it results in a complete loss or reduction of the eyes.

  4. If Pax6 is lost, still lens formation takes place in presence of Sox2 and L-maf.

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TLS Online TPP Program

#Question id: 19723

#Unit 3. Fundamental Processes

Reduction in the telomerase activity after the cell cycle is the notion of 
a) Cell ageing
b) Senescence 
c) Apoptosis
TLS Online TPP Program

#Question id: 1107

#Unit 4. Cell Communication and Cell Signaling

Viagra causes dilation of blood vessels and increased blood flow to the penis, facilitating erection. Viagra acts by inhibiting which of the following events?
TLS Online TPP Program

#Question id: 16101

#Unit 7. System Physiology – Animal

The set-point temperature of the hypothalamus triggering heat loss or heat generating mechanisms is
TLS Online TPP Program

#Question id: 17079

#Unit 12. Applied Biology

The major disadvantages of using serum in the culture medium could be
TLS Online TPP Program

#Question id: 1801

#Unit 4. Cell Communication and Cell Signaling

Which of the following is the earliest site of hematopoiesis in the embryo?