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TLS Online TPP Program

#Question id: 23670

How might infection of a plant by E. coli transformed with a recombinant Ti plasmid be used to have a new gene (e.g. insect toxin) expressed in all cells of the plant?

#Unit 13. Methods in Biology
  1. The original plant will eventually express the new gene in all its cells even if only a few cells of the plant are initially infected by E. coli.
  2. Pollen cells must be infected and then used to produce the next generation of plants which will express the new gene in all cells.
  3. Any cell from the original plant that is infected with the E. coli is removed and treated to dedifferentiate and eventually to grow into an entire new plant in which the new gene is expressed throughout.
  4. All of the above
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TLS Online TPP Program

#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,
TLS Online TPP Program

#Question id: 4495

#Unit 3. Fundamental Processes

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

#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;
TLS Online TPP Program

#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

TLS Online TPP Program

#Question id: 4498

#Unit 3. Fundamental Processes

Which enzyme is used in this particular mechanism;
TLS Online TPP Program

#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,