DNA is negatively charged due to its phosphate groups. Gel electrophoresis has one side that is positive and other that is negative. Once dna fragments are placed inside. The bigger fragments will move towards the positive side since positive is attracted to negative.
Answer:
Uranium
Nuclear reactors require the use of nuclear fuels, elements that can be readily altered and will release thermal energy. Uranium is the most common element used as a nuclear fuel, although thorium is also possible.
Explanation:
All nuclear power plants use nuclear fission, and most nuclear power plants use uranium atoms. During nuclear fission, a neutron collides with a uranium atom and splits it, releasing a large amount of energy in the form of heat and radiation.
Answer:
The answer would be A. The sun is behind the moon, which casts its shadow on Earth.
In a solar eclipse, the moon blocks the sun, meaning that the moon would have to be positioned in front of the sun. This would mean that the sun is behind the moon, while the moon's shadow is cast on Earth.
Answer:
Starting with natural selection, the most robust and most intelligent animals survive over the weakest. The weak animals eventually die off because they can't keep up with nature. Artificial selection isn't natural; certain species are being targeted on purpose and decide whether to stay alive or not. At this point, it is not at all about whether the species can survive or not because it's most likely being protected.
The determination of the cause of death can be difficult in the following three circumstances:
1. When the body of the victim (dead person) has been damaged after the death. It includes the damage from fire, mutilation, crushing and immersion in strong chemicals.
2. When the dead remains (skeletal) is recovered a long time after the person died, so that no signs are left of the fatal injury.
3. When the person died because of poisoning of trace chemicals that cannot be detected in such small amounts.
