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likoan [24]
3 years ago
7

What forms the structure called a coral reef?

Biology
2 answers:
Sati [7]3 years ago
8 0
A because when the little fish die they sink to the bottom, and after time the skeletons build up on top of each other. 
bearhunter [10]3 years ago
3 0

Answer: a. skeletons of coral animals

A coral reef is a deep underwater ecosystem exhibiting walls or reefs build by corals. These reefs are formed by the colonies of organisms called as polyps, which are held together by calcium carbonate. The coral reefs are build in order to form stony corals, because of clustering of the polyps. The hard skeletonized structure provide protection to the polyps. These also provide shelter to small marine organisms like fishes.  






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Histones are a group of proteins with a N-terminal end of an amino acid, that binds to the DNA in the nucleus helping it to condense into Chromatin. DNA wraps around a core of proteins to initially form the NUCLEOSO ME structure, which is the basic subunit of Chromatin. Each nucleosome is made up of DNA coiled around two copies (2) of proteins- H2A, H2B, H3 and H4, to form a set of eight proteins called histone octamer.

Due to the phosphate group (PO4-) embedded in the DNA molecule, they assume a negative charge. The positively charged ions of the N(C) terminal end of histones which arise from the amino acid group they contain allows it to bind tightly to negatively charged DNA i.e. the more positively and negatively charged the histone and DNA are respectively, the tighter the binding.

Due to this property, the proteins that binds to DNA in E.coli, should possess a positive charge in similarity to histones in eukaryotes.

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