The pressure-flow model, first proposed by Ernst Münch, Phloem loading at the source and phloem unloading at the sink establish the pressure gradient.

a.) In source tissues, an accumulation of sugars in the sieve elements generates a lower or negative solute potential (ψs).

 b.) source tissue, causes a steep drop in the water potential (ψ), due to water potential gradient, water enters the sieve elements and causes turgor pressure (ψp ) decrease.

c.) In sink tissues, phloem unloading leads to a lower sugar concentration in the sieve elements, generating a higher or less negative solute potential.

d.) As the water potential of the phloem rises above that of the xylem, water tends to leave the phloem in response to the water potential gradient, causing a decrease in turgor pressure in the sieve elements of the sink.

Which of the following statements of sink and source tissue is FALSE?

TLS Online TPP Program

#Question id: 26449

#Unit 3. Fundamental Processes

Ability of core and holoenzyme to transcribe DNAs differs, so choose which of the following is correct

a.With  subunit, the holoenzyme worked equally well on both intact as well as nicked types of DNA

b.With  subunit, the holoenzyme worked unequally on both intact as well as nicked types of DNA

c.Core subunit α2ββσ can not perform polymerization on to the intact DNA while perform some of the activity on to the nicked DNA

d.Core subunit α2ββσ can not perform polymerization on to the intact DNA AS WELL AS  to the nicked DNA

TLS Online TPP Program

#Question id: 26448

#Unit 3. Fundamental Processes

Choose the correct statement regarding DNA photolyase 

a.MTHF polyglu absorb blue light photon of 300-500 nm

b.And the MTHF polyglu radicalize FADH cofactor

c.And this FADH cofactor donate single electron to CBD 

d.And this FADH cofactor donate many electron to CBD

TLS Online TPP Program

#Question id: 26447

#Unit 3. Fundamental Processes

Which polymerases are template-dependent, they incorporate nucleotides in a manner that is independent of base pairing

TLS Online TPP Program

#Question id: 26446

#Unit 3. Fundamental Processes

Which of the following is a universal marker for double strand breaks

TLS Online TPP Program

#Question id: 26445

#Unit 3. Fundamental Processes

In transcription-coupled repair (TC-NER) TFIIH, itself a large complex, which includes the products of two XP genes, XPB and XPD, which of the following is correctly representing the function of XPB and XPD

TLS Online TPP Program

#Question id: 26444

#Unit 3. Fundamental Processes

global genome repair (GG-NER) depending on proteins