How can bacteria be grown in a lab?

Answer 1

1. the only way viruses can reproduce is by inserting themselves into a cell and taking it over, forcing the cell to make copies of the virus.
2. bacteria reproduce by dividing in two (fission), this is usually asexual but under certain circumstances two bacteria can exchange some DNA in a process similar to sexual reproduction before dividing.

Answer 2

Viruses are like a parasite on a cellular level. Technically they aren't even living. There are multiple types of Viruses that do many things. The type of Virus your most likely asking about is called a Bacteriophage. They are basically a strand of DNA covered by a special membrane that allows them to break through cell membranes. The Virus breaks through the membrane outside of a cell (bacteria is a single cell organism) and "hijacks" the cell. Since cell's produce proteins according to which part of the genetic code they are reading, the Virus alters the DNA of the cell by injecting its own DNA into the nucleus in order to trick the cell into producing more Viruses or at least all the proteins the Viruses need in order to assemble. The Viruses then reproduce inside the cell in mass quantities until they burst from the cell and repeat the process on their next victim. After this happens the cell either dies or is left alive and will produce more cells. These new cells will then continue to produce more of the same virus.

If your question was how do people do it purposely, i don't exactly know. Other than introducing a certain virus to a certain bacteria in a dish. Hope this helps!

Answer 3

because the virus injects acid into the cell and the nucleic acid directs the cell to make new parts which makes new viruses form.