The krebs cycle will not take place if

Answer,

The Krebs Cycle will not take place if there is no oxygen.

Explanation,

The Krebs Cycle does not directly require oxygen but it does not take place when there is no oxygen. This is because, it depends on by-products from the electron transport chain. Therefore, that of which requires oxygen.

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format change of dna.  

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.