TLS Online TPP Program

#Question id: 7186


In dictyostelium stalk and spore cell maturation depends on cAMP level. Which of the following statement is incorrect regarding to this process?

#Unit 5. Developmental Biology
  1. During spore formation, ACG localizes to the spore surface when the prespore vesicles fuse with the plasma membrane. The cAMP phosphodiesterase RegA also plays a crucial role in regulating intracellular cAMP levels.
  2. This process is mediated by socalled sensor histidine kinases/phosphatases which either phosphorylate or dephosphorylate themselves on a histidine residue when a signal molecule binds to their sensor domain.
  3. Ammonia inhibits the onset of fruiting body formation and stalk maturation, activates the histidine phosphatase activity of sensor histidine phophatase C (DhkC), resulting in RegA activation, hydrolysis of cAMP and inhibition of PKA activity.
  4. Spore differentiation factor 2 (SDF-2) activates the histidine phosphatase activity of DhkA (histidine phosphatase A), which results in the inactivation of RegA, the accumulation of cAMP and in PKA activation, which subsequently causes spore maturation.
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TLS Online TPP Program

#Question id: 11047

#Unit 6. System Physiology – Plant

As plants absorb water from the soil, they deplete the soil of water near the surface of the roots, This depletion due to

TLS Online TPP Program

#Question id: 11048

#Unit 6. System Physiology – Plant

In vascular plants, phloem is the living tissue that transports the soluble organic compound made during photosynthesis in the form of sugar, The phloem tissue is made up of cells called phloem elements. Which of the following given phloem elements are directly involved in translocation?

TLS Online TPP Program

#Question id: 11049

#Unit 6. System Physiology – Plant

Match the CORRECT combination of the phloem elements with its function.

            PHLOEM ELEMENTS                                                  FUNCTIONS

P) sieve tube elements                                    i) for protection and strengthening of the tissue

Q) sieve cells                                                  ii) store and release food molecules

R) companion cells                                        iii) food translocation in angiosperm

S) Phloem parenchyma cells                          iv) latex containing cells

T) Phloem fibers and sclereids                       v) help in flow of solute and show high, metabolic activity

U) laticifers                                                     vi) food translocation on gymnosperm

TLS Online TPP Program

#Question id: 11050

#Unit 6. System Physiology – Plant

Three dimensional reconstructions of Arabidopsis sieve plates using a staining technique that can be used to image entire plant organs and Open sieve pores are visible as well as callose plug are also visible which technique used to analyze

TLS Online TPP Program

#Question id: 11051

#Unit 10. Ecological Principles

Disadvantages of living in groups include

TLS Online TPP Program

#Question id: 11052

#Unit 10. Ecological Principles

An example of territoriality is