Final answer:
The use of two coenzymes for metabolism instead of three is not a way that cells regulate their metabolism, which involves the synthesis of transport proteins, enzyme isolation, and enzyme regulation mechanisms.
Step-by-step explanation:
The aspect of a cell's ability to regulate its metabolism that does not contribute to metabolic control is C) the use of two coenzymes for metabolism instead of three. Cells control their metabolism through various methods, such as the synthesis or degradation of membrane transport proteins and the isolation of various enzymes within membranous organelles.
The number of coenzymes used for metabolism is not considered a regulatory mechanism. Regulatory processes include the enzyme regulation, where inhibitors and activators can affect catalysis, and the transport of glucose into the cell using different forms of glucose transporter proteins.