(a) Discuss the role of chromosomal islands in microbial diversiIty. (b) State three reasons why chromosomal islands are presumed to be of "foreign" origin.
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A: Asked : MRSA, VRE, MRSE, DRSP, VRSA, and VISA stand for.
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- 25) Identify the most correct choice: a) ribosomes are the membrane bound organelles responsible for making proteins from RNAs. b) In gene therapy, Agrobacterium is the bacteria that transfers genetic material into the human cells that contain the mutated gene. c) spectrophotometer analysis can be used to detect the concentration of the dead cells in a solution only and not those that are living. d) None of the above.In his work with pneumonia-causing bacteria andmice, Griffith found that(A) the protein coat from pathogenic cells wasable to transform nonpathogenic cells.(B) heat-killed pathogenic cells causedpneumonia.(C) some substance from pathogenic cells was transferred tononpathogenic cells, making them pathogenic.(D) the polysaccharide coat of bacteria causedpneumonia.The rate at which large DNA fragments move through the electrophoretic gel is ________ the rate at which small DNA fragments move through the same apparatus. a) Less than b) Greater than c) The same as d) None of the above After TRIZOL extraction and centrifugation, your tube looks like this. Which fraction should you collect if you want the RNA? a) “Cloudy”-looking interphase b) The aqueous phase c) The organic phase d) Everything except the organic phase How many different bases are associated with RNA? a) 5 b) 4 c) 3 d) 6
- Select the true statements: A.) It is possible, through genetic engineering, to fuse a fluorescent molecule (example GFP) with a non-fluorescent protein to create a fluorescent fusion protein. B.) Proteins are created during gene transcription. C.) It is possible to observe a fluorescent protein immediately after the plasmid coding for this protein is introduced into a cell. D.) The plasma coding for a fluorescent protein is also fluorescent. E.) It is possible to obtain a different color fluorescent fusion protein by replacing the sequence coding for the fluorescent protein in the plasmid for a sequence coding for a fluorescent protein by a different color sequence.Which of the following is/are evidence that mitochondria and bacteria are descendants of bacteria? (Select all that apply.) a) The DNA structure of mitochondria and chloroplasts is similar to that of bacteria b) The DNA sequence of mitochondria and chloroplasts is similar to that of bacteria c) Mitochondria and chloroplasts have their own genomes that are not enclosed in a nuclear envelope. d) MItochondria and chloroplasts have their own ribosomes.In a process of production of a recombinant protein by E. coli cells, it was observed accumulation of acetate in the culture medium. In this situation, it can be said that: (a) certainly the process in question was being conducted in anaerobiosis (B).Acetate accumulation is advantageous for the process as the acetate formation reaction generates 1 molecule of ATP (c)Knowing that decreasing the temperature of the process causes a reduction in the rate of glycolysis, this could be a strategy to reduce the accumulation of acetate (d).the acetate formed can be re-assimilated by the cell if the glyoxylate pathway is activated at some point in the culture
- Identify the most mistaken (wrong) choice: a) Transcription machinery and an enhancer can bind to the chromosome at the same time. b) Organic matters may interfere with heat treatment of bacterial growth control. ( c) Nitrocellulose can be used to filter out microorganisms from a liquid solution. d) Time to kill a bacterial culture is not proportional to the number of microbes in the culture65. Destruction of the group of cells identified by the arrows in the photomicrograph shown is most likely to result in which of the following conditions? A) Anemia B) Cirrhosis C) Impotence D) Type 1 diabetes mellitus E) UlcerQ. Cro protein expression and activity may be activated in a prophage by a)lysogenic dominance b)rapid growth of a healthy cell c)repair of damaged cellular DNA d)presence of glucose in the environment alternate exon splicing of mRNA
- 35. If radioactive thymidine were introduced into the growth medium of actively dividing cells, it would be incorporated into the DNA molecule ... a) during the G1 phase when the cell does most of its growth. b) during S phase. c) as the cell passes the G1 Restriction Point. d) when centromeres split so the two chromosomes can be separated. e) at any point in the cell cycle.Identify the single most correct choice: a) DNA replication is a non-conservative process. b) Peroxide and ozone can be used as antimicrobial agents and their mechanism of action is via oxidizing molecules inside the cells. c) Antibiotics can never be used as food preservatives. d) All of the above.42) If the gene encoding the enzyme rubisco is mutated such that it is non-functional, the process that would be affected is the ability to... A) Make ATP B) Harvest photons C) Fix carbon D) Make 02 E) Make NADPH