Answer: Option a
Explanation:
Mast cells play a vital in the inflammatory and immediate allergic reactions. These cells release inflammatory mediators such as histamines, cytokines and chemotactic factors.
These chemicals acts on the smooth muscles, mucous glands and the inflammatory cells.
Histamines are not only released when the body detects any antigen it is also released during the time of injury.
The final aspect of the nitrogen cycle is the process of denitrification. In that process, varies organism like microscopic bacteria, and fungi decompose the nitrate in the soil into nitrogen gas which they release into the air.
From https://www.cas.miamioh.edu/mbi-ws/biogeochemicalcycles/Nitrogen/nitrogen.htm
Answer:
an individual must have two copies of a recessive allele to express the trait.
Explanation:
Answer:
4. ribosome
Explanation:
The only option of the four which synthesises enzymes is a ribosome
The tetrad occurs during the first phase of meiosis. It is the foursome of chromatids that forms when replicated homologous chromosomes align. It must be formed for crossing over to occur. It is broken apart when the homologous chromosomes separate in meiosis I