Studies done by Buchner showed that ground-up yeast cells were able to convert sugar to alcohol. The components of the mixture that were responsible for this transformation were

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: 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: 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: 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: 12200

#Unit 6. System Physiology – Plant

Given some observation of the auxin signalling pathway, which one of the following are the incorrect prediction about signalling?

TLS Online TPP Program

#Question id: 12201

#Unit 6. System Physiology – Plant

ARF dependent signalling are regulated by auxin concenteration, given some condition followed;

I) In the absence of auxin

 II) In the presence of auxin

Find the statements that are correctly matched with given certain condition,

a)  AUX/IAA repressor proteins containing interaction domains similar to those found in the ARFs form heterodimers with the ARFs and thus repress transcriptional activation

b)  AUX/IAA repressors are recruited to the TIR1/AFB receptor complex and are tagged with ubiquitin for degradation by the 26S proteasome

c) ARFs form homodimers via conserved interaction domains and recruit chromatin remodelling

Which of the following combination is correct?