<span>it was molecular structure of DNA this was appeared 1n April 1953 Watson and Crick presented the structure of DNA- Helix.it carried the genetic information. the DNA Molecule shaped in twisted ladder.franklin produced an X- ray photograph.
DNA structure is made of molecules called nucleotide. Watson and crick also work on 3-D structure of DNA. this mark the history in molecular biology to understanding the genes control and genetic information.they also work on cell.they use stick and ball to understand to test their idea.</span>
Messages are slower acting and longer lasting. Plus they are classified as hormones, transported in the blood.
Answer:
1) Immunogene
2) immunoglobulin / antibodies
3) Antigen
4 Vaccine
Explanation:
Vaccine: vaccines are made from a weakened or killed form of a Disease causing micro organism
Antigen : these are toxins or foreign substances that causes or stimulates immune response in the body
Immunoglobulin: they are also known as antibodies, they are protein produced by the by the white blood cells to combat foreign substances
Immunogene: these are molecules or substances that have the capability of stimulating immune response by the immune system of an organism.
Answer: True.
Explanation: Many greenhouse gases occur naturally in the atmosphere, such as carbon dioxide, methane, water vapor, and nitrous oxide, while others are synthetic.
Explanation:
North America is a continent entirely within the Northern Hemisphere and almost all within the Western Hemisphere. In can also be described as a northern subcontinent of the Americas[5][6] in models that use fewer than seven continents. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the west and south by the Pacific Ocean, and to the southeast by South America and the Caribbean Sea.North America covers an area of about 24,709,000 square kilometers (9,540,000 square miles), about 16.5% of the earth's land area and about 4.8% of its total surface.
