What must be carefully regulated if chemical reactions (metabolism) are to proceed efficiently?

The internal composition of the cell and the internal conditions of the cell.

Define selective exchange.

The process in which a membrane allows some substances to pass in and/or out of the cell whilst not allowing others to do likewise.

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C4) Regulated IE

Regulation of the internal environment

Question	Answer
What are molecules manufactured by cell called?	Organic molecules.
What must be carefully regulated if chemical reactions (metabolism) are to proceed efficiently?	The internal composition of the cell and the internal conditions of the cell.
Define selective exchange.	The process in which a membrane allows some substances to pass in and/or out of the cell whilst not allowing others to do likewise.