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arlik [135]
3 years ago
9

Desalination is needed in order to obtain potable water from _____.

Biology
2 answers:
I am Lyosha [343]3 years ago
7 0

Answer:

oceans = D

Explanation:

Vinvika [58]3 years ago
4 0
Answer:  [D]:  "oceans" .
_______________________________________
Note:  Among the answer choices given—{aquifers, glaciers, lakes, oceans}—oceans are the saltiest (VERY salty—requiring "desalination" in order to obtain potable water.
________________________________________
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Answer:

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Explanation:

The histones that are more positively charged, tight hardly to negatively charged DNA. So, enzymes, such as acetyltransferases, that reduce the positive charge of histones promote transcription.

Chromatin structure and its modifications can change the package of the DNA and consequently, alter the gene expression. The most common modifications of the chromatin are covalent modifications such as acetylation/deacetylation (by acetyltransferases and eacetylases), methylation (by methyltransferases), and phosphorylation (by kinases).  This is the way of gene expression regulation.

The effects of modifications are different, for example methylation promotes  condensation of the chromatin and as a consequence, prevents binding of transcription factors to the DNA (transcription is repressed).

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Explanation:

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