The correct answer is "Hfr strains have the F plasmid integrated into the chromosome".
This is in the context of horizontal gene transfer in bacteria. This gene transfer consist of transferring an "F plasmid" in a process called bacterial conjugation. Bacteria with the F plasmid are termed as "F+ strains". The key difference between an Hfr strain and a F+ strain is that while they both have the F plasmid; the Hfr strain have the F plasmid integrated to its chromosome while the F+ strain have the F plasmid not integrated to the genetic material and only freely floats in the cytoplasm.
<span>Rivers can be polluted by nitrates because the fertilizers in the field that contain nitrates are washed into the river because of rain and flooding. Other source of nitrate pollution in the rivers is the mixing of sewage which contains human and animal wastes.</span>
C. Cycling, the joints that are used are your thyroid muscles and your hip flexors
1. The water will leave the cell.
Hypertonic solution
2. There will be no net movement of water.
Isotonic solution
3. The water will leave the cell.
Hypertonic solution
4. The water will enter the cell.
Hypotonic solution
5. I predict that the water will move into the cell because inside the cell, the concentration of water molecules is less than that of outside the cell. According to the process of osmosis, water moves from a region of high water concentration to a region of low water concentration.
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the DNA molecule is t-RNA which curlers up to be transported and then elongates to read the info on the protein