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You
inoculate a strain of E. coli into a broth culture and allow it to
grow....
You inoculate a strain of E. coli into a broth culture and allow it to grow....
You inoculate a strain of E. coli into a broth culture and allow it to grow. The broth medium contains three sugars: glucose, lactose, and maltose. The strain you are growing prefers lactose to maltose. You measured the growth by doing a viable cell count and drew a growth curve after calculating the number of CFU/ml over time. There was an initial lag phase, followed by an exponential phase. There was a second lag phase of approximately 30 minutes followed...
The gene machine program shows you what happens when lactose is present in E. coli, and...
The gene machine program shows you what happens when lactose is present in E. coli, and how the lac operon is under negative control. However, the lac operon is also under positive control from a protein called CRP, eAMP Receptor Protein. The absence of the lac repressor is essential but not sufficient for effective transcription of the lac operon. RNA polymerase also depends on the presence of CRP. Like the lac repressor, which can bind to the DNA and lactose....
consider a strain of E. coli that has a mutation in the gene encoding the IIA...
consider a strain of E. coli that has a mutation in the gene encoding the IIA protein of the phosphotransferase system. The transport and phosphorylation of glucose is not affected by this mutation and the phosphate group is transferred to glucose as in the wildtype strain. Also, the interaction between the mutant IIA protein and Lacy is not affected by the mutation. However, the mutation does affect the IIA protein's interactions with adenylate cyclase and the phosphorylated form of the...
6. A bacterial geneticist mixes 109 cells of E. coli strain A which requires lysine and...
6. A bacterial geneticist mixes 109 cells of E. coli strain A which requires lysine and is ampicillin sensitive with 109 cells of strain B which requires phenylalanine and tyrosine and is ampicillin resistant. In order to detect whether genetic recombination had occurred between the two strains it would be best to grow the mixture of cells in A) minimal glucose medium plus ampicillin B) minimal glucose medium with no supplements C) minimal glucose medium plus lysine and phenylalanine D)...
1, (12 pts.) You are fortunate to obtain a strain of E. coli from the Pasteur...
1, (12 pts.) You are fortunate to obtain a strain of E. coli from the Pasteur Institute labeled #348, preserved from the work of Jacob & Monod. The genotype of the strain is Lac LacP Laco' Lacz' LacY. The Lacf mutation results in resistance to allolactose allosteric inhibition so it is always bound to the LacO operator. The LacY is a mutation resulting in zero permease activity. Lucky for you, today's echnology allows you to test this bacterial strain to...
1. You are studying phage transduction and trying to deliver a kanamycin resistance gene from one...
1. You are studying phage transduction and trying to deliver a kanamycin resistance gene from one strain of bacteria to another using phage. The kanR gene is FAR away from the lambda prophage in your bacterium. Choose which type of transduction should you use for your experiment and explain why. a. lambda phage, specialized transduction b. lambda phage, conjugation C. T4 phage, generalized transduction d. A different phage with mitomycin C induction 2. A pig is infected with two subtypes...
I need help answering the following microbiology questions. 1. The three tubes in the image to...
I need help answering the following microbiology
questions.
1. The three tubes in the image to the right contain glucose and the pH indicator phenol red. The middle and left tubes were inoculated with bacteria, and the right tube was left uninoculated as a control. Which of the tubes show evidence of heterolactic fermentation? a. Left tube Gas b. Middle tube c. Right tube d. None of the three tubes Yellow Red Red 2. Which of the three tubes in...
You inoculate a strain of E. coli into a broth culture and allow it to grow. The broth medium contains three sugars: glucose, lactose, and maltose. The strain you are growing prefers lactose to maltose. You measured the growth by doing a viable cell count and drew a growth curve after calculating the number of CFU/ml over time. There was an initial lag phase, followed by an exponential phase. There was a second lag phase of approximately 30 minutes followed...
The gene machine program shows you what happens when lactose is present in E. coli, and how the lac operon is under negative control. However, the lac operon is also under positive control from a protein called CRP, eAMP Receptor Protein. The absence of the lac repressor is essential but not sufficient for effective transcription of the lac operon. RNA polymerase also depends on the presence of CRP. Like the lac repressor, which can bind to the DNA and lactose....
consider a strain of E. coli that has a mutation in the gene encoding the IIA protein of the phosphotransferase system. The transport and phosphorylation of glucose is not affected by this mutation and the phosphate group is transferred to glucose as in the wildtype strain. Also, the interaction between the mutant IIA protein and Lacy is not affected by the mutation. However, the mutation does affect the IIA protein's interactions with adenylate cyclase and the phosphorylated form of the...
1, (12 pts.) You are fortunate to obtain a strain of E. coli from the Pasteur Institute labeled #348, preserved from the work of Jacob & Monod. The genotype of the strain is Lac LacP Laco' Lacz' LacY. The Lacf mutation results in resistance to allolactose allosteric inhibition so it is always bound to the LacO operator. The LacY is a mutation resulting in zero permease activity. Lucky for you, today's echnology allows you to test this bacterial strain to...
1. You are studying phage transduction and trying to deliver a kanamycin resistance gene from one strain of bacteria to another using phage. The kanR gene is FAR away from the lambda prophage in your bacterium. Choose which type of transduction should you use for your experiment and explain why. a. lambda phage, specialized transduction b. lambda phage, conjugation C. T4 phage, generalized transduction d. A different phage with mitomycin C induction 2. A pig is infected with two subtypes...
I need help answering the following microbiology
questions.
1. The three tubes in the image to the right contain glucose and the pH indicator phenol red. The middle and left tubes were inoculated with bacteria, and the right tube was left uninoculated as a control. Which of the tubes show evidence of heterolactic fermentation? a. Left tube Gas b. Middle tube c. Right tube d. None of the three tubes Yellow Red Red 2. Which of the three tubes in...
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