No they do not. Scientists study it to figure it out why some have it and others do not. It is quite rare, actually. Certain humans are capable of things most would consider strange and not human, such as being able to calculate things at an incredible speed, or an athlete faster than an Olympic medalist.
Answer:
- Pesticide 1: Induces transition mutations. Rat liver enzymes convert it into a nonmutagenic product. Does not induce frameshift mutations.
- Pesticide 2: Does not induce transition mutations. Rat liver enzymes convert it into frameshift mutagen.
- Pesticide 3: Induces transition mutations. Rat liver enzymes don't have ability to convert compounds into mutagens. Does not induce frameshift mutations.
Explanation:
The Ames test is a technique widely used to evaluate the mutagenic potential of a particular chemical compound. The Ames test uses <em>Salmonella typhimurium</em> strains with a defective mutation that makes them unable to synthesize histidine. When the mutation is reversed, then the revertant strains can grow on a medium lacking histidine. A positive test shows that the chemical is mutagenic because its activity is associated with the reversed mutation and thereby the mutant gene regains its function. In humans, as well as in other mammals, many chemicals don't have mutagenic effects themselves but they may become converted into mutagens when are metabolized by the body. For that reason, rat liver enzymes are added to replicate the metabolic effects of the chemical compound being tested. Nowadays, current tests can express recombinant human proteins instead of rat liver enzymes, thereby enabling a better correlation between mutagenic activity and human metabolic processes.
I think the correct answer from the choices listed above is option D. The term Middle Ages is best defined by the period following the decline of the Roman Empire in Europe. This period lasted from 5th century to the 15th century. Hope this answers the question. Have a nice day.<span />
Its C) Mitochondria, hope I was correct and that I helped