If a cell contains a $$ 0.9 \% $$ concentration of NaCl , what concentration is needed outside of the cell in order for it to be isotonic? Multiple Choice Question $$ 10 \% \mathrm{NaCl} $$ $$ 0.9 \% \mathrm{NaCl} $$ O $$ 0 \% \mathrm{NaCl} $$ $$ 0.09 \% \mathrm{NaCl} $$

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$$ 0.9\% \mathrm{NaCl} $$ To maintain isotonic conditions, the concentration of NaCl outside the cell must match the concentration inside the cell. Since the cell contains a $$ 0.9\% $$ concentration of NaCl, the solution outside the cell must also be $$ 0.9\% $$ NaCl to achieve isotonicity. Therefore, the correct answer is: **$$ 0.9\% \mathrm{NaCl} $$**

If a cell contains a \( 0.9 \% \) concentration of NaCl , what concentration is needed outside of the cell in order for it to be isotonic? Multiple Choice Question \( 10 \% \mathrm{NaCl} \) \( 0.9 \% \mathrm{NaCl} \) O \( 0 \% \mathrm{NaCl} \) \( 0.09 \% \mathrm{NaCl} \)

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If a cell contains a \( 0.9 \% \) concentration of NaCl , what concentration is needed outside of the cell in order for it to be isotonic? Multiple Choice Question \( 10 \% \mathrm{NaCl} \) \( 0.9 \% \mathrm{NaCl} \) O \( 0 \% \mathrm{NaCl} \) \( 0.09 \% \mathrm{NaCl} \)

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