Answer:
E. Gene is amplified by multiplication of cloning host
Explanation:
PCR is a very powerful technique that can help us to amplify exponentially one gene from a very small sample of DNA.
As seen in the attached image, the process begins with a single DNA molecule, for the first cycle, that DNA molecule denaturalizes into two strands, the primers bind to their complementary sides and then the DNA polymerase builds the new DNA strands. The number of copies of the gene that can be obtained with each cycle are 2ⁿ copies, where n is the cycle number.
Answer:
Ice cream isn't exactly a meal but when you go through the process of making it, it starts out as a liquid then becomes solid. Most people who've made ice cream as a kid have done the experiment with 2 Ziploc bags, kosher salt, heavy cream, vanilla, sugar, and milk. And of course the ice. You begin to get a solidified figure once you mix everything in the first bag then surround that bag with another bag filled with the ice and salt and shake. So this would count as physical change.
If you cook a steak it'd go through a chemical change. The proteins in the meat begin to break down due to the heat in a skillet, grill, pot, etc. This meat also goes through a physical change. The color changes and so does the texture. (Not that I've ever had raw meat. Bleh!)
Hope this helped!
Atoms, Molecules, Cells, Tissues, Organs, Organ system are all building blocks to growing an organism. Hope this helps. :)