Practice Questions

TLS Online TPP Program

#Question id: 7768

The insulin signaling pathway inhibits the synthesis of the Foxo transcription factor proteins that would otherwise increase cellular longevity. Downregulation of the insulin signaling pathway has several other functions, choose right one

#Unit 5. Developmental Biology

It appears to influence metabolism, increasing mitochondrial electron transport.
When the DAF-2 receptor is not active, cells increase the production of enzymes that prevent oxidative damage, as well as DNA repair enzymes.
This lack of insulin signaling increases fertility.
Decrease in DNA synthetic enzymes and in enzymes that protect against ROS is due to the Foxo/DAF-16 transcription factor

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TLS Online TPP Program

#Question id: 12199

#Unit 6. System Physiology – Plant

Some given statements about Auxin signalling pathways are listed;

a) The auxin receptor is composed of two proteins: the SCF complex component TIR1 and the repressor protein AUX/IAA

b) The binding of auxin to its receptor complex initiates ubiquitin-dependent degradation of the AUX/ IAA repressor protein by the 26S proteasome

c) TIR1 recruits AUX/ IAA proteins to the SCFTIR1 complex in an auxin-independent manner

d) AUX/IAA proteins are ubiquitinated by the E3 ligase activity of the SCFTIR1 complex, which marks the protein for destruction by the 26S proteasome

Which of the following is correct explanation of Auxin signalling pathways?

TLS Online TPP Program

#Question id: 12198

#Unit 6. System Physiology – Plant

In theory, auxin could increase the rate of proton extrusion by some possible mechanisms such as:

a) Activation of pre-existing plasma membrane H+- ATPases

b) Synthesis of new H+-ATPases on the plasma membrane

c) Auxin-Induced Proton Extrusion May Involve Both Activation and Synthesis

TLS Online TPP Program

#Question id: 12197

#Unit 6. System Physiology – Plant

The following are certain facts regarding Auxin transport in plants;

a) Auxin transport is polarly has been proposed through Chemiosmotic Model

b) Auxin translocation in the phloem is largely passive, not requiring energy directly

c) Polar transport requires energy and is gravity dependent

d) Auxin is transported nonpolarly in the Phloem

Which one of the following combination of the above statements is correct?

TLS Online TPP Program

#Question id: 12196

#Unit 6. System Physiology – Plant

IAN pathway may be important in only few plant families:

TLS Online TPP Program

#Question id: 12195

#Unit 6. System Physiology – Plant

Which one of the following is function as endogenous regulators of polar auxin transport?

TLS Online TPP Program

#Question id: 12194

#Unit 6. System Physiology – Plant

Which of the following are the correct statements of inhibitors of auxin?