The information contained within the gene is copied into a new molecule by the process of transcription. Transcription is a process by which the information from one strand of DNA is copied into a new molecule called messenger RNA or mRNA. Even though mRNA contains the same information it is not the exact copy of the DNA segment. Protein molecules include DNA and RNA and the genetic information is copied into the protein molecules by the process of transcription and translation. Transcription is a process by which the information coded in DNA is transferred to RNA, where as translation is a process where mRNA provides information for the Ribosome the type of amino acid to link with. As amino acids are made up of proteins there will be transfer of information contained in a gene to be transferred to protein. Whereas the function of tRNA is to carry amino acids to ribosome during the transcription hence it does not carry any genetic information where as rRNA combines with the set of proteins to form ribosomes. These rRNA molecule moves along with the mRNA molecule but does not carry any genetic information.
Therefore the answer is d
Answer:
d. a second exposure to an allergen
Explanation:
An autoimmune disease is a condition that occurs when the immune system attacks and destroys healthy body tissues by mistake.
Normally, white blood cells (leukocytes), produced in the bone marrow and found in the blood, help to protect the body against invasive and harmful substances known as antigens. Examples are viruses, bacteria, toxins, cancer cells, etc. Leukocytes are a fundamental part of the immune system, whose main function is to produce antibodies that keep the human body protected from the action of these antigens by destroying them.
In the case of autoimmune diseases, the immune system cannot distinguish antigens from healthy body tissues and ends up attacking and destroying normal body cells.
The causes of autoimmune diseases are not yet known, although there are many mechanisms that trigger these diseases. However, we can confirm that these diseases are not caused by a second exposure to an allergen, which is a substance that can induce a hypersensitivity reaction in some people.
Answer:
There are biotic factors which are living things or things that used to be living(fish, birds, etc), and abiotic factors which are things that are not alive and have never been alive(rocks, water, etc).
Explanation:
Radon is colorless at standard temperature and pressure and it is the most dense gas known. At temperature below it's freezing point is has a brilliant yellow phosphorescence. It is chemically nonreactive, it is highly radioactive and has a short half life.
Answer: b. to form RNA molecules form DNA
