Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 5 - Membranes - Review Questions - Apply: 3

Answer

D.

Work Step by Step

Hydrogen bonds between phosphate and water (D.) will occur no matter what, so this has no role in selectivity. A. and B. both affect selectivity by helping only certain molecules to cross the membrane, and C. also affects selectivity by keeping hydrophobic molecules from crossing unless they have help from a protein as in A. and B.
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