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Purified ATPase was incubated with 200 µM dicyclohexylcarbodiimide (DCCD) at pH 7.6 (A) and 9.0 (B). Individual mixtures contained no NaCl (open circles), 1 mM NaCl (closed triangles), 10 mM NaCl (open triangles), and 50 mM NaCl (closed squares). ATPase reactivity was initiated by 4 mM ATP, and the residual ATPase activity of the samples was measured at various times. The graph with the closed circles is the control with no DCCD. Which of the conclusions about the role of Na+ in the activity of this ATPase is valid based on the collected data?

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Purified ATPase was incubated with 200 µM dicyclohexylcarbodiimide (DCCD) at pH 7.6 (A) and 9.0 (B). Individual mixtures contained no NaCl (open circles), 1 mM NaCl (closed triangles), 10 mM NaCl (open triangles), and 50 mM NaCl (closed squares). ATPase reactivity was initiated by 4 mM ATP, and the residual ATPase activity of the samples was measured at various times. The graph with the closed circles is the control with no DCCD. <br><img src='https://www.fatskills.com/images3/mcat/172.tiff.gif'><br>Which of the conclusions about the role of Na+ in the activity of this ATPase is valid based on the collected data?






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