Because of their relatively simple genetic structure when compared to other organisms. Not to mention, they breed in extremely high numbers which is great for scientists looking to do many trials, as most are. Their life cycle is also very short which means we can observe their entire life span and witness the effects of testing at all stages.
The cardiovascular system structure. Hope this helps :)
<span>For the first step, you must isolate the cells from the media. The cells contain the DNA so you keep the cells and pellet.
The next step would be a cell lysis which causes the cells to open and the DNA to come out. At this point you would keep the supernatant, as the pellet is the cell membrane and other parts of the cell.
The chelex is to bind to transition metal ions. This would cause and DNases in the cell to become inactive because the metal ion is their cofactor. The pellet in this case would contain the chelex and the DNA would still be in the supernatant.</span>
<h2>
Low-Gravity</h2>
We would be taller
We would be more fat
We would require more exercise
We would get unhealthy more quickly
We would be able to do many things that are not easy on Earth
We would not be able to do somethings that are easy on Earth
We would have more muscles, less bones
<h2>
High-Gravity</h2>
We would be Short
We will be thin
We will not require that much exercise
We will be usually healthy
Heavy people will suffer from disease more
A little weight increase can make lots of differences in the body.
Thanks!