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: 10561

#Unit 6. System Physiology – Plant

Integral membrane proteins that form water-selective channels across the membrane, Because water diffuses faster through such channels than through a lipid bilayer

TLS Online TPP Program

#Question id: 10562

#Unit 6. System Physiology – Plant

The direction and rate of water flow across a membrane are determined by

TLS Online TPP Program

#Question id: 10563

#Unit 6. System Physiology – Plant

The rate of diffusion depend upon

TLS Online TPP Program

#Question id: 10564

#Unit 6. System Physiology – Plant

The term Ys , called the solute potential or the osmotic potential, represents the effect of dissolved solutes on water potential,

a) The mixing of solutes and water reduces the disorder of the system and thereby lowers free energy

b) Solutes reduce the free energy of water by diluting the water

c) The mixing of solutes and water increases the disorder of the system and thereby lowers free energy

d) Solutes increases the free energy of water by diluting the water

 Which one of the following statements are INCORRECT?

TLS Online TPP Program

#Question id: 10565

#Unit 6. System Physiology – Plant

The term Yp is the hydrostatic pressure of the solution

TLS Online TPP Program

#Question id: 10566

#Unit 6. System Physiology – Plant

What happens if this cell is placed in the beaker containing 0.1 M sucrose, Because the water potential of the sucrose solution (Yw = –0.244) is greater than the water potential of the cell (Yw = –0.732 MPa)

a) Water will move from the cell to the sucrose solution

b) From high to low water potential

c) From low to high water potential

d) Water will move from the sucrose solution to the cell

Which of the following statement is CORRECT?