The mechanisms that regulate the loading of sucrose from the apoplast to the sieve elements by the sucrose–H+ symporter await characterization. Possible regulatory factors include the following:

a) The solute potential or, more likely, the turgor pressure of the sieve elements

b) Sucrose concentration in the apoplast

c) The available number of symporter protein molecules

Which one of the mechanism that involve to regulate the loading of sucrose?

#Question id: 4504

#Unit 3. Fundamental Processes

What will be the molecular weight of poly(A) chain consisting of 100 residues, where weight of AMP is 500?

#Question id: 4505

#Unit 3. Fundamental Processes

Symplekin protein is participats in which of the following processes;

#Question id: 4506

#Unit 3. Fundamental Processes

Which process is very much similar to polyadenylation, because its takes place by the multiple protein complexes,

#Question id: 4507

#Unit 3. Fundamental Processes

A group of introns that-unlike those we have considered thus far-can splice themselves out of pre-mRNA without the need for the spliceosome, they are called

#Question id: 4508

#Unit 3. Fundamental Processes

Statement: In the case of group II introns, the chemistry of splicing and the RNA intermediates produced are the same as those for nuclear pre-mRNA.

 Explanations: I. The intron uses an A residue within the branch site to attack the phosphodiester bond at the boundary between its 5’ end and the end of the 5’ exon-that is, at the 5’ splice site. This reaction produces the branched lariat.

II. A second reaction in which the newly freed 3’ -OH of the exon attacks the 3’splice site, releasing the intron as a lariat and fusing the 3’ and 5’ exons.

#Question id: 4509

#Unit 3. Fundamental Processes

Which group of introns contain an “internal guide sequence”