Decomposers also break down the bodies of dead organisms resulting in nitrogen being returned to the soil as ammonia. In some conditions denitrifying bacteria in the soil break down nitrates and return nitrogen to the air.
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Answer:
the proteins on its surface and that of the host
Explanation:
The process of viral infection begins with the entry of the virus to its host cells. For this purpose, viral surface proteins attach to receptor proteins found on target host cells. For example, the coronavirus responsible for the pandemic contains spike (S) proteins on its surface that bind to angiotensin-converting enzyme 2 (ACE2) receptors and thus infects host target cells. Moreover, the specificity of the binding determines the ability to infect and the host range of the viruses. In the case of coronavirus, it has been suggested that ACE2 receptors are not fully developed in children, thereby children would be less susceptible to viral infection.
Answer: A peptide bond
Explanation:
A peptide bond is a type of bond that covalently joins two amino acids to yield a dipeptide. A peptide bond is formed by removal of elements of water from the alpha carboxyl group of one amino acid and the alpha amino group of another amino acid. When two amino acids are joined by a peptide bond, a dipeptide is produced. When three amino acids are joined by two peptide bonds, a tripeptide is produced. When a few amino acids are joined by peptide bonds, an oligopeptide is produced while when many amino acids are joined, the product is called a polypeptide.
Answer:
Primary succession is the colonization of species of organisms on life-less barren lands after a volcanic eruption, newly formed land, or sand dunes. Lichens and mosses are the known primary succession community of organisms that helps in developing conditions for secondary succession by breaking rocks and providing soil.
After a fair amount of time, there are new species of organisms that grow and colonize in the land and these are, and ultimately the community becomes fairly stable. A climax community is a more stable, mature community that undergoes little or no change which can live for hundreds of years on the land.
The long-term survival of species is dependent on various kind of resources that may be limited, this can be explained by the lichens and mosses that have enough amount of nutrition and resources during primary succession but as new organism comes with complex structure and competes with these lichens and mosses their number decline due to limited amount of resources.
Answer:
Stem cells are called extraordinary by the narrator because stems cells which is mostly gotten from bone marrow is use in medicine for regeneration and repair of damaged tissues and organs. It is use to correct part of organs that is not working properly. It has been use for treatment of diseases over the years.
Explanation:
Stem cells are special human cells that have the ability to develop into some specialized cells which can be used to regenerate and repair damaged tissues and organs.
Stem cells can be use to replace tissues that has been damaged through diseases and it has been use for treatment of different type of diseases over the years.