Cells use different mechanisms to respond to external signals.One mechanism uses ion channels that respond by opening or closing.Another mechanism uses transcription factors that respond by turning on or turning off the expression of genes.A third mechanism uses _______ that respond by altering the rate of chemical reactions in the cell.
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Q231: Refer to the figure below.
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Q233: Refer to the figure below.
Q234: Refer to the table below.
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