2: an agent that causes a mutation in DNA.
Hope this helps
A mutagen is any agent capable of altering the genetic constitution of a cell by changing the structure of DNA.
Many forms of electromagnetic radiation such as cosmic rays, X rays, ultraviolet light and a variety of chemical compounds are mutagenic.
The agent that causes mutation in the DNA or chromosomes is called as mutagen. This can be any chemical or physical substance that can change the genetic material generally DNA or chromosome. This increases the frequency of mutation above the natural background level. These mutagens can cause cancer and hence can also be called as carcinogens though it is not always necessary. Mutagens can cause changes in DNA and make it genotoxic that can be fatal for the cells.
The correct answer is B) An agent that causes a mutation in the DNA.
Mutagen is a chemical or a physical agent that brings change in the genetic material of an individual and therefore increases the chances of mutation(permanent change in the genetic material).
Therefore, it is an agent that causes mutation in the DNA.
Example of mutagen- Ionizing radiation (like X- rays) , UV radiations.
The correct answer is-
an agent that causes a mutation in DNA.
Mutagen is an agent or a substance that causes permanent change in the genetic material of living organisms ( DNA, deoxyribonucleic acid). This process is called mutation.
A mutagen can be a chemical, physical or biological agent that causes mutation in the DNA.
Example- Physical agents such as -Ionizing radiations like alpha particles, gamma rays, X-rays that brings break in the DNA and cause other damages.Ultraviolet radiations that creates pyrimidine dimers ( T=T) and causes replication errors if damage is not repaired.
A a living thing that has undergone a mutation.
A component or a molecule which when incorporated into the DNA changes its genetic composition is called a mutagen.
A mutagen is a compound that might be chemical or physical in nature and cause changes in the genetic material which are heritable and irreversible. When the repair mechanism is unable to recognize the mutagenic effects, it tends to escape the lesions created by the mutagen. Such mutations or lesions become fixed with time and can be inherited by the progeny cells. The changes occurred due to mutagen are called mutations.
The mutations caused due to mutagens are known as induced mutations whereas, some mutations occur spontaneously due to DNA replication error, error in recombination and repair and are called spontaneous mutations.
The mutagens are categorized as follows:
1. Chemical mutagens
The chemical compounds such as aromatic amines, alkylating agents, and deaminating agents directly interact with the DNA and produce mutagenic effects. For example, nitrous oxide is a deaminating agent and causes cytosine to convert into uracil changing the DNA sequence. The alkylating agents result in breakages and crosslinking in the DNA by adding ethyl or methyl group to the bases.
2. Physical mutagens
The ionizing radiations, radioactive decay, and the ultraviolet radiations are the physical agents that cause mutations in the DNA. The radiations like gamma rays and X-rays result in DNA breakages. The ultraviolet radiations absorbed by the bases results in the formation of pyrimidine dimers.
3. Biological mutagens
Bacteria, viruses, and transposons act as biological agents to bring about mutation. The transposons translocate into DNA fragment and disrupt the genetic composition of the functional genes. The virus also disrupts the genetic function once incorporated into the genome. Certain bacteria produce oxidative species which cause DNA damage and increase the mutation efficiency.
1. Learn more about aerobic and anaerobic respiration
2. Learn more about cellular respiration
3. Learn more about alcoholic
Mutation, mutagen, physical mutagens, chemical mutagens, biological mutagens, alkylating agents, aromatic amines, ionizing radiations, transposons, bacteria, virus, deaminating agents.
any agent that cause a mutation would be called a mutagen
It would be the second one
the answer is B on edg 2020