Homework Answers
N and cro proteins are the first two proteins produced once lambda phage enters into the host e.coli. tehy are called early transcript proteins that are responsible for the otehr protein productions
2.Both phage-encoded proteins, the CII transcription activator and the CIII polypeptide, are required for efficient lysogenic response. Hence they will be produced for efficient lysogenic cycle and for integration into host cell
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5 points. When lambda infects an E. coli host what are the first two proteins that...
5 points. Can a wild-type lambda phage infect and kill an E. coli host that harbors...
5 points. Can a wild-type lambda phage infect and kill an E. coli host that harbors a wild-type lambda lysogen? Yes or No? 5 points. Can a wild-type lambda phage infect and kill an E. coli host that does not make the LamB protein? Yes or No?
When the pathogen Salmonella typhimurium infects mammalian cells, the host cell protease caspase-1 is enabled to...
When the pathogen Salmonella typhimurium infects mammalian cells, the host cell protease caspase-1 is enabled to cleave and thereby activate signaling proteins that instigate the immune response. The targets of caspase-1 also include aldolase and enolase. What effect would this have on the infected cell and why might this be advantageous to the organism?
What are the RecBCD proteins of E. coli and what do they do? What is a...
What are the RecBCD proteins of E. coli and what do they do? What is a Chi sequence and what is its function?
E. coli often comes to mind when reading about proteins and discussing them and it often...
E. coli often comes to mind when reading about proteins and discussing them and it often makes headlines in the news. My challenge for this chapter's discussion topic is this: find a recent (within the last month) news article that involves E. coli and share it with the class. Why does it seem that this bacteria is always in the news? Remember, this chapter is the protein chapter, so why is E. coli so important to proteins and vice versa?...
Expression of a heterologous protein in CHO cells and in an E. coli system produced proteins...
Expression of a heterologous protein in CHO cells and in an E. coli system produced proteins with the same molecular weight on SDS-PAGE. Subsequent in vitro bioactivity studies demonstrated high-level activity with the CHO cell-derived recombinant protein, but no bioactivity with the E. coli derived product. Explain this discrepancy, and propose an experiment to test your hypothesis
B4 (a). Explain the role of following proteins in the replication of E. coli chromosome (10...
B4 (a). Explain the role of following proteins in the replication of E. coli chromosome (10 points) 1) RNase H 2) Gyrase 3) Primase 4) Dna C
An operon in E. coli called the Pur operon, encodes proteins responsible for purine biosynthesis. Two...
An operon in E. coli called the Pur operon, encodes proteins responsible for purine biosynthesis. Two genes, purA and purB are under the control of a single promoter and operator, similar to the arrangement in the lac and trp operons. A repressor protein, purR, binds to the operator. In what conditions (high purine or low purine) do you suppose this repressor binds to the operator? Do you consider this a “repressible” or “inducible” operon?
What are the two possible primary electron donors when E. coli is grown aerobically on glucose?
What are the two possible primary electron donors when E. coli is grown aerobically on glucose?
5. Describe the molecular mechanism that determines lysogeny or lysis of the host cell. What genes/proteins...
5. Describe the molecular mechanism that determines lysogeny or lysis of the host cell. What genes/proteins are involved? What determines if the cell exits lysogeny and enters the lytic cycle? Distinguish between early-immediate, early, and late gene transcription. What processes are occurring in these stages of transcription?
Question 5 (1 point) What is the order of events in infection by lambda phage? |...
Question 5 (1 point) What is the order of events in infection by lambda phage? | The phage P(R) and P(L) promoters are switched on Either the phage becomes lysogenic or lytic. > The phage enters E. coli > Either the phage P(RM) or P(RE) promoter is switched on. > cro and c(l) complete for the O(R1), O(R2), and O(R3) operators. Question 6 (1 point) (Multiselect) For phage lambda to enter the lysogenic cycle: cro must occupy the R1 operator....
5 points. Can a wild-type lambda phage infect and kill an E. coli host that harbors a wild-type lambda lysogen? Yes or No? 5 points. Can a wild-type lambda phage infect and kill an E. coli host that does not make the LamB protein? Yes or No?
B4 (a). Explain the role of following proteins in the replication of E. coli chromosome (10 points) 1) RNase H 2) Gyrase 3) Primase 4) Dna C
Question 5 (1 point) What is the order of events in infection by lambda phage? | The phage P(R) and P(L) promoters are switched on Either the phage becomes lysogenic or lytic. > The phage enters E. coli > Either the phage P(RM) or P(RE) promoter is switched on. > cro and c(l) complete for the O(R1), O(R2), and O(R3) operators. Question 6 (1 point) (Multiselect) For phage lambda to enter the lysogenic cycle: cro must occupy the R1 operator....
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