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Semmy [17]
3 years ago
6

Why is cellulose considered to be a complex carbohydrate? It is composed of a complex arrangement of glucose molecules. It is co

mposed of a long straight chain of glucose molecules. It is composed of a complex arrrangement of chitin molecules. It is composed of two carbon molecules joined with a double bond.
Biology
2 answers:
mel-nik [20]3 years ago
8 0
The correct answer is the last one.
Svetllana [295]3 years ago
7 0
The last one is your answer I believe
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Answer:

No, CREs usually don't account for differences in gene expression levels.

Explanation:

<em>Cis</em>-regulatory elements (CREs) are non-coding DNA regions that regulate adjacent gene <em>transcription</em>. They usually do it by binding to transcription factors. They are in charge of influencing the rate of which transcription occurs, and less with how much a gene is expressed. On the other hand, trans-regulatory elements are DNA sequences that encode for upstream regulators that can modify or regulate <em>gene expression levels</em>.

Therefore, cis elements are not really in charge of expression levels, mostly transcription rates of single genes, rather. Trans elements are more involved in expression levels.

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Anvisha [2.4K]

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nydimaria [60]

Answer:

The correct answer is - higher than

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In the lumen of the proximal tubule of the kidney, most of the solutes are absorbed in the form of sodium. There is a gradient of sodium ions which allows the absorption of the solutes from the lumen into the cell.

It is due to the solute or  Na concentration is higher in the lumen than Na concentration inside the cells of the tubule wall. So movement of the solutes is due to the concentration gradient.

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