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3 votes
Which one of the following molecules can MOST easily pass through the plasma membrane unassisted?

A. Ca2+, a positive ion

B. Cl−, a negative ion

C. CO2, a nonpolar gas

D. glucose, a large sugar

1 Answer

4 votes

Answer:

The smaller and nonpolar molecules

pass through more easily.

So pick CO2.

User GnrlBzik
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