If an E. coli auxotroph X could grow only on a medium containing leucine, and an auxotroph Y could grow only on a medium containing threonine. (i) Write the genotype of both E. coli strains. (ii) How would you test whether DNA from X could transform Y?
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- An auxotroph bacterium A could grow only on a medium containing leucine, and an auxotroph bacterium B could not grow on a medium containing galactose as the sole carbon source. (i) What is the genotype of strain A and B, respectively? (ii) How would you test whether DNA from A could transform B?(a) What do reverse transcriptases do? Give two examples of these and what they do in the cell. (b) What is an auxotroph and how are these obtained and isolated for study? please give answer for both questions thank youTime mapping is performed in a cross involving the genes his, leu, mal, and xyl. The recipient cells were auxotrophic for all four genes. After 25 minutes, mating was interrupted with the following results in recipient cells. Diagram the positions of these genes relative to the origin (O) of the F factor and to one another. (a) 90% were xyl+ (b) 80% were mal+ (c) 20% were his+ (d) none were leu+
- Schizosaccharomyces pombe, also known as "fission yeast," is a powerful model organism in molecular and cell biology. While performing a genetic screen, you discover an auxotrophic S. pombe strain that is unable to synthesize one or more vitamins. The following table represents the key experiments you performed during your genetic screen. Fill in the table with the outcome of each experiment for your mutant strain (using + for growth and - for no growth). Medium Rich media Minimal media Minimal media + all vitamins Minimal media + all amino acids Growth Wild-type + + + + Mutant + + + > > >In transformation, a bacterial cell takes up DNA fragments from its surroundings. The figure shows the process of natural transformation. Position the labels below with the correct images. (A) Donor and recipient genomes The donor strand is integrated into the recipient chromosome and the displaced bacterial DNA is degraded. A wild-type donor cell is in the vicinity of a double auxotroph. If the wild-type cell lyses, it releases DNA into the environment. One cell is identical to the original recipient, while the other carries the wild-type genes. A competent recipient cells a receptor site on its surface. One strand of donor DNA enters the cell and pairs with a homologous region of the bacterial chromosome The remaining DNA strand is degraded. A donor DNA strand binds to the receptor site. Reset trpC1 Wild-type donor cell Mechanism of natural transformation Donor DNA hal Receptor site- trpc/his double auxotroph Recipient cell Competent cell recipient -Bacterial chromosome (had.bpC") Ma…Imagine that there is an E. coli outbreak in your area, and you would like to test the kangkong from your local grocery store. How could you modify this protocol to extract DNA from the kangkong (to identify the species) and check for presence or absence of E. coli.? Keep in mind that (i) E. coli is free-living and not an endosymbiont, and (ii) plant cells are encased in both a cell membrane and cell wall.
- Genetically modified foods are products produced from organisms that have had changes introduced into their DNA using the methods of genetic engineering. Golden rice, Flavr Savr tomatoes and Roundup Ready soyabeans are products of this technology. Discuss the advantages of these three genetically modified crops. Name ONE (1) strategy to produce transformed plant cells.Prototrophy is often the phenotype selected to detecttransformants. Prototrophic cells are used for donorDNA extraction; then this DNA is cloned and the clonesare added to an auxotrophic recipient culture. Successfultransformants are identified by plating the recipientculture on minimal medium and looking for colonies.What experimental design would you use to make surethat a colony that you hope is a transformant is not, infact,a. a prototrophic cell that has entered the recipientculture as a contaminant?b. a revertant (mutation back to prototrophy by a secondmutation in the originally mutated gene) of theauxotrophic mutation?To be able to recognize a colony of bacteria that had grown from cells of Mycoplasma capricolum in which the DNA had been replaced by a synthetic DNA of Mycoplasma mycoides, Daniel Gibson added a that coded for a blue pigment. (a) cell (b) chromosome (c) gene (d) bacterium
- A selectable marker is used in the section of recombinants on the basis of their ability to produce colour in presence of chromogenic substrate.(a) Mention the name of mechanism involved.(b) Which enzyme is involved in production of colour?(c) How is it advantageous over using antibiotic resistant gene as a selectable marker?Figure 4 shows the hybridization process between plant P and Q. b) What is process A?A prototrophic strain (his" arg" lac') was used as a donor to transform an auxotrophic strain (his arg lac'). Initial transformants are isolated on minimal medium + histidine + arginine + lactose - glucose. i. What genotypes will grow on this medium? ii. These colonies are replicated to minimal medium + histidine, and 50% of the original colonies grow. What genotypes will grow on this medium? iii. The original colonies are also replicated to minimal medium + arginine, and 10% of the colonies grow. What genotypes will grow on this medium? iv. The original colonies are also replicated to minimal medium. No colonies grow. Based on this information, what genotypes will grow on minimal medium + histidine and on minimal medium + arginine? What is the relative gene order for his, arg, and lac? Which two genes are closer? Explain your answer.