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.
The mechanisms of reproductive isolation<span> are a collection of evolutionary mechanisms, behaviors and physiological processes critical for speciation. They prevent members of different species from producing offspring, or ensure that any offspring are sterile.</span>
In a direct democracy, power is inherited rather than allocated through elections.
Answer: Option A
<u>Explanation:</u>
Direct democracy means where the citizens can participate in making decisions. Here citizens possess the right to vote against issues instead of a candidate or party. Here everyone has the right to take decisions. It’s a participatory kind of democracy where the decisions are affected by the people.
If a group is affected because of an issue they can directly apply for a recall. Here the direct interaction of people plays a vital role. In most countries this direct democracy is not in practice as it was outsmarted by bunch of elites who wanted to monopolize power.
Answer:
Should be to store the genetic information ans control center of the cell
Answer:
the answer is C, eddicient frontier
Explanation: