Many of the carriers of Sucrose–H+ symporters in the phloem play various role in transport, most of the transporters are found in source, path, and sink tissues. Some carriers are characterized such as;

a) SUT1, has high-affinity / low-capacity transporter found in the minor veins of source tissues, appears to be important in phloem loading.

b) Important role of SUT1 in phloem loading appears to be complemented by SUT4, which is low-affinity/high-capacity carrier

c) SUT2, appears to function as a sucrose sensor. This is indicated by findings showing that SUT2 is more highly expressed in sink and path tissues than in source leaves.

d) The major sucrose transporters in phloem loading into the companion cells and final uptake into companion cells appears to be the function of SUT4

Which of the following combination is correct?

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#Question id: 4494

#Unit 3. Fundamental Processes

Propagation of certain repressing histone modifications over stretches of chromatin lies at the heart of a phenomenon is known,

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#Question id: 4495

#Unit 3. Fundamental Processes

_ elements can block this spreading, protect genes from both indiscriminate activation and repression.

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#Question id: 4496

#Unit 3. Fundamental Processes

Facilitates chromatin transcription was identified in human cell extracts, this factor makes transcription on chromatin templates much more efficient, choose correct statements;

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#Question id: 4497

#Unit 3. Fundamental Processes

Elongation, termination of transcription, and RNA processing are interconnected, presumably to ensure their proper coordination,

Elongation factors
I.    hSPT5	To recruit the 5’ -capping enzyme to the CTD tail of polymerase
II.   TAT-SF1	To recruits components of the splicing machinery to polymerase with a Ser-2 phosphorylated tail

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#Question id: 4498

#Unit 3. Fundamental Processes

Which enzyme is used in this particular mechanism;

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#Question id: 4499

#Unit 3. Fundamental Processes

The final RNA processing event, polyadenylation of the 3’end of the mRNA, is intimately linked with the termination of transcription. Just as with capping and splicing, the polymerase CTD tail is involved in recruiting some of the enzymes necessary for polyadenylation,